Great Lisbon Earthquake of 1755

Stuff You Missed in History Class

On November 1, 1755, a massive earthquake took place on the floor of the Atlantic Ocean southwest of Lisbon, Portugal. The destruction in Portugal led to one of the first coordinated government responses to a natural disaster.

Research:

  • Algarve History Association. “The 1755 Lisbon Earthquake and the Algarve.” https://www.algarvehistoryassociation.com/en/portuguese-history/algarve-history/194-the-1755-lisbon-earthquake-and-the-algarve
  • Blanc, P.-L.: Earthquakes and tsunami in November 1755 in Morocco: a different reading of contemporaneous documentary sources, Nat. Hazards Earth Syst. Sci., 9, 725–738, https://doi.org/10.5194/nhess-9-725-2009, 2009.
  • Borlase, William. “The Natural History of Cornwall.” Oxford : printed for the author; by W. Jackson: sold by W. Sandby, London; and the booksellers of Oxford. 1758.
  • Cavendish, Richard. “Pombal and the Inquisition in Portugal.” History Today. 5/5/2001. https://www.historytoday.com/archive/months-past/pombal-and-inquisition-portugal
  • Dynes, Russell R. “The Lisbon Earthquake in 1755: The First Modern Disaster.” University of Delaware Disaster Research Center. Preliminary Paper #333.
  • Joel, Lucas. “November 1, 1755: Earthquake Destroys Lisbon.” EARTH. November/December 2015.
  • Lai, Dria. “The Great Lisbon Earthquake: A Journey through the First Modern Disaster.” https://storymaps.arcgis.com/stories/e30a2ea6401e4f2e8805dfbcfa604dc5
  • Lisbon Earthquake Museum. “Inquérito.” https://lisbonquake.com/en-GB/blog/inquerito
  • Lisbon Earthquake Museum. “Providências.” https://lisbonquake.com/en-GB/blog/providencias
  • Martínez-Loriente, S., Sallarès, V. & Gràcia, E. The Horseshoe Abyssal plain Thrust could be the source of the 1755 Lisbon earthquake and tsunami. Commun Earth Environ 2, 145 (2021). https://doi.org/10.1038/s43247-021-00216-5
  • Mascarenhas, J., Belgas, L., Branco, F.G., Vieira, E. (2024). The Pombaline Cage (“Gaiola Pombalina”): An European Anti-seismic System Based on Enlightenment Era of Experimentation. In: Endo, Y., Hanazato, T. (eds) Structural Analysis of Historical Constructions. SAHC 2023. RILEM Bookseries, vol 47. Springer, Cham. https://doi.org/10.1007/978-3-031-39603-8_5
  • Molesky, Mark. “The Vicar and the Earthquake: Conflict, Controversy, and a Christening during the Great Lisbon Disaster of 1755.” e-JPH, Vol. 10, number 2, Winter 2012.
  • Penwith Local History Group. “The Mounts Bay Tsunami.” https://www.penwithlocalhistorygroup.co.uk/on-this-day/?id=269

Pereira, Alvaro S. “The Opportunity of a Disaster: The Economic Impact of the 1755 Lisbon Earthquake.” The Journal of Economic History , Jun. 2009. Via JSTOR. https://www.jstor.org/stable/40263964

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2026-02-18 39 min Transcript

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Transcript

00:00:01
Speaker 1: Welcome to Stuff You Missed in History Class, a production of iHeartRadio. Hello and welcome to the podcast. I'm Tracy V. Wilson and I'm Holly Frye.

00:00:16
Speaker 2: At various points on our trip to Morocco last year, our guides talked about the Great Lisbon earthquake of seventeen fifty five. It started at our very first stop on our very first full day in Morocco, at Hassen Tower in robot so Kleif. Abu Yusuf Yakub al Mansour commissioned a mosque at the end of the twelfth century, but then he died before construction on it was finished, and it was never completed. Before his death, red sandstone Minaret had been built to about half its planned height. It was supposed to be the tallest minaret in the world once it was done, but of course it was never finished, and there were also some exterior walls and hundreds of columns. A lot of these columns collapsed in the earthquake, and today their remnants are sort of standing before the minaret at different heights, depending on how much of them is left. So this earthquake kept coming up over the rest of the trip. Our guides would say that a site had been uncovered in the earthquake or damaged in the earthquake, and it made me really curious because they kept saying Lisbon over and over. They were talking about the Lisbon earthquake. But this earthquake was obviously also a big enough deal in Morocco that people are still talking about it at historic sites two hundred years later. I had definitely heard of this earthquake before, because it is depicted in Voltaire's Candide, which I have read and have also seen a theatrical adaptation of. But I did not fully connect the setting of Candide to the realities of an actual historic events. So that's today's episode. This earthquake took place on November first, seventeen fifty five. Its epicenter was on the boundary between the African and Eurasian tectonic plates, on the floor of the Atlantic Ocean, two hundred to three hundred kilometers southwest of Lisbon, Portugal and about three hundred and fifty kilometers northwest of Casablanca, Morocco. Those are obviously all approximations in terms of its distance. There have been lots of efforts to pinpoint the exact epicenter. But this tectonic boundary is really complex, and the earthquake itself was also really complex. There were three distinct periods of shaking over the course of about fifteen to twenty minutes, and there has been debate about whether at least one of those was really an aftershock, or if there were two different earthquakes very close together.

00:02:59
Speaker 1: Yeah, I read a.

00:02:59
Speaker 2: Few different papers that pretty confidently said this is where the epicenter was, and they were not in exactly the same point. They had different substantiation for why they had come to that conclusion. Does not seem like there is exact agreement on the exact location of where it started. Today, earthquakes are measured using the moment magnitude scale that started replacing the Richter scale in the nineteen eighties. There's no upper limit to this scale, but the strongest earthquake ever recorded struck Chile in nineteen sixty, and that had a magnitude of nine point five. The magnitude of the seventeen fifty five earthquake has been estimated based on eighteenth century accounts and other data, and it's generally accepted as having a magnitude of between eight point five and nine, although there are a few estimates that have arrived at like a somewhat lower number. Regardless, though a very powerful earthquake, and this earthquakes most destructive effects were in Portugal, Morocco and Spain. This isn't an area that's really associated with a ton of major earthquakes prior to this. In seventeen twenty two and earthquakes struck southern Portugal, but many of the records of that earthquake were destroyed in seventeen fifty five, so we don't have a lot of detail about it. Earlier major earthquakes in Portugal took place in thirteen fifty six and fifteen thirty one. An earthquake struck Fez, Morocco in sixteen twenty four and caused extensive damage. An earthquake that struck Almedia in southern Spain in fifteen twenty two killed an estimated two thousand, five hundred people and it destroyed most of the city. So major earthquakes were not unheard of in this region, but they were widely spaced. They often happened centuries apart. The November one, seventeen fifty five earthquake was felt as far away as Britain in Ireland in the north, Hamburg, Germany in the northeast, the Azores Archipelago in the west, and the Cape Verde Islands off the coast of what's now Senegal to the southwest. There were also reports of disturbances in lakes and rivers, including the formation of standing waves all across western and northern Europe, and then after shocks went on for months. This earthquake also spawned a tsunami, which devastated the coasts of Morocco, Spain, and Portugal, as well as islands and archipelagoes to the west of Northern Africa and the Iberian Peninsula. It caused major damage to ports and coastal settlements in all of these places. Many of Morocco's cities were surrounded by walls, which could offer some protection from a tsunami, but in some places this tsunami measured about twenty meters or sixty six feet, so it crested over the top of those walls and it flooded the city's interiors. Having been in some of those cities, that prospect is terrifying to me.

00:06:01
Speaker 1: Yeah, because then there's no way for the water to get out.

00:06:05
Speaker 2: No no, so Obviously, in addition to being very destructive, this was deadly. This tsunami was also reported as far north as the British and Irish Isles. For example, a series of waves measuring six to ten feet or about two to three meters struck the coast of Cornwall. Then on the other side of the Atlantic Ocean, a similarly sized wave also struck the coast of Newfoundland, and there were waves of about one meter or three feet that struck much of the Caribbean. In the coast of Brazil, Smaller waves from the tsunami were also reported all along the eastern coasts of North and South America. Sediments from the tsunami have also been found as far away as Scotland. Information did not travel nearly as quickly in seventeen to fifty five as it does today, and the Japanese word tsunami had not made its way into europe and languages yet, but people did understand that earthquakes could be connected to flooding and unusually massive waves or tides. For example, William Borlaize published a book on the natural history of Cornwall in seventeen fifty eight, and he described the huge waves that struck Mount's Bay in seventeen fifty five, he talked about the city of Lisbon being destroyed in an earthquake that same day, with the Tagus River in Lisbon rising twenty to thirty feet in cycles, and ships at sea sixty leagues from port feeling the shock as though they had run aground. Borlais wrote that it was difficult to say exactly what connection there might be between what happened in Cornwall and in Portugal, but quote, all these circumstances seemed to declare very confidently that what we felt was either the fainter part of that deplorable shock at Lisbon, or the last expiring efforts of some similar subterraneous struggles farther to the west and southwest under the Atlantic Ocean. There were also two other major earthquakes in November of seventeen fifty five in addition to this one. On November eighteenth, an earthquake struck off the coast of Cape ann in Massachusetts, with an estimated magnitude of five point eight. That is much smaller than the November first earthquake, but it is the largest known earthquake ever to strike Massachusetts. It topped a lot of chimneys and church steeples, and it knocked over fences, and it woke up John Adams, who wrote about it in his diary. There is speculation that the seismic conditions that led to this earthquake were triggered by the earthquake on November first.

00:08:46
Speaker 1: And there was also another earthquake in Morocco later in November. Documentation on this one is tricky. It struck the city of Mechnus, which is southwest of Fez. Both cities were badly damaged in an estimated fifteen thousand people were killed. Sources in Arabic consistently report the date of this earthquake is happening on November twenty seventh, but there are also European reports of a strong earthquake in this part of Morocco on November eighteenth, which was believed to be a strong aftershock of that November first earthquake. Various writing from the eighteenth century and later conflates all of these earthquakes, and it is completely possible that some of the damage our guides in Morocco attributed to the November first earthquake really happened later in the month. During these secondary events, the seventeen fifty five Mechnez earthquake occurred on a different fault than the Lisbon earthquake, but it is possible that it also developed from the seismic effects of that earlier quake. Estimates of the death toll from the November first earthquake and the tsunami and fires that followed it, which we haven't even talked about the fires at all are all over the place, like wildly all over the place. The lowest estimates are about ten thousand people, but the highest estimates report one hundred thousand people. Some of this is because Lisbon, which faced some of the worst impacts, that didn't have really an accurate estimate of the population from before the earthquake. Bodies were also buried really quickly to try to prevent the spread of disease, so there wasn't a careful accounting of the dead. It's also likely that some people just fled the hardest hit areas and then weren't really tracked afterward. And it's also complicated because that earthquake in Morocco just a few weeks later also had a significant death toll, and it's not always clear which of these earthquakes a person might have died in even if those lower estimates are closer to correct. This was one of the most destructive earthquakes ever to strike Southern Europe and northern Africa. It also had a devastating effect on Lisbon, the capital of Portugal. It was the biggest disaster to strike a European capital since the Great Fire of London in sixteen sixty six. We'll have more detail on Lisbon after a sponsor break in seventeen fifty five.

00:11:30
Speaker 2: Lisbon, Portugal, was the fourth largest city in Europe after London, Paris, and Naples. As a nation, Portugal had become wealthy thanks to its colonial empire, particularly gold mines in Brazil, which were run using enslaved labor. Initially, Portugal had enslaved both indigenous people and Africans in Brazil, but the enslavement of indigenous Americans was banned in April of seventeen fifty five in part with the hope that indigenous peoples would ally with Portugal and border disputes with Spain. More enslaved Africans were ultimately transported to Brazil than to anywhere else in the world. In spite of its wealth, Lisbon was not really thought of as being in the same league as those other larger cities. For one thing, with a population of about two hundred and seventy five thousand people, it was significantly smaller than London or Paris. For comparison, London's population was approaching three times that and Paris was about twice as populous as Lisbon. Portugal was also dependent on England for its naval defense. These two nations had a relationship that had gone back for centuries, and then in seventeen oh three, during the War of the Spanish Succession, they had signed the Methuen Treaties. Those were named for British negotiator John Methuen. Under these treaties, the British navy would safeguard Portugal's ports and their trade, and then the two nations would also have various favored trading statuses with one another. Trade goods that were part of these treaties included British textiles and Portuguese wines. Portugal did not have a lot of industrial exports of its own, and as a result of this relationship with England, port cities, including Lisbon, had a really sizeable community of British merchants known as the English Factory. They also used the term English or British pretty broadly, meaning anyone from those islands that they were just sort of everyone lumped together. This also means that a lot of that gold mine wealth, while it was making Portugal wealthy, it was also ultimately winding up in the UK. Other major European powers also regarded Portugal as somewhat backward and superstitious. This also had some connections to religion. Like most of the rest of Europe, Portugal had a state religion, in this case Roman Catholicism, but Portugal also had a particularly large number of clergy compared to its population. There were probably fewer than two million people living in all of Portugal, and as many as two hundred thousand of them were Catholic clergy. This was a time when the Church was often tightly interconnected with daily life in countries all over Europe, but that number was just seen as a lot. Beyond that, the Jesuit Order had control of Portuguese missions in the Americas and the higher education system in Portugal. The Portuguese Inquisition had also been established in the fifteen thirties and modeled after the Spanish Inquisition, targeting heretics as well as people who had been forced to convert to Christianity but were believed to secretly still beach Jewish, including their descendants. The total number of cases the Portuguese Inquisition tried and the number of people that it put to death were smaller than that of the Spanish Inquisition, but it was proportionately greater. Portugal had also been on the periphery of the scientific revolution that led to major developments in other parts of Europe in the sixteenth and seventeenth centuries. The Inquisition censored published material in Portugal, which meant that some scientific works just were not available in Portuguese. In the eighteenth century, people who tried to introduce new scientific discoveries into Portugal were known as enstraggiados, which was the term for Europeanized intellectuals. Sebastian Jose de carvaljo Emelo, secretary of State for Foreign affairs in war, wasn't Estrangerrado and had been trying to limit the Inquisition's power in the years leading up to the earthquake, but it was still a major force in Portugal, and various intellectuals and scholars had been forced out of Portugal because of it. Yeah, the fact that, like intellectuals who were trying to introduce new scientific discoveries were being thought of as europeanized ye, and like Portugal is part of Europe, but like it's clear that from that mindset, the people who were introducing these thoughts were being thought of as other, Yeah, and then being described using.

00:16:26
Speaker 1: A term that.

00:16:30
Speaker 2: Has common origins with like stranger. Yeah, Like that just sort of illustrates untrustworthy. Yeah, yeah, what was happening in Portugal. There is also a connection between religion and why the seventeen fifty five earthquake was so devastating to the city of Lisbon. The earthquake started at about nine to forty in the morning on All Saints' Day, that is the major holiday in the Catholic Church, So a lot of people in Lisbon and most of the other cities and towns in Portugal were at mass that included the royal family Portugals. Churches and monasteries were typically very very tall and architecturally complex, and a lot of them just collapsed during the earthquake with people inside. Much of Lisbon was also destroyed by fire in the aftermath of the earthquake. Those fires started as the quake was happening, many of them sparked by candles and lamps falling from the altars and other places around the churches. There were also some eyewitness reports of fires being intentionally set by looters. These fires spread due to strong winds, and the massive scale of destruction from the earthquake made the fires even harder to fight. Those fires burned for about five days. As we said a moment ago, the first wave of the earthquake started at about nine forty in the morning. It was intense enough to raise a cloud of dust around Lisbon as buildings started collapsing, and this dust really blocked out a lot of the sunlight. Another even more destructive period of shaking started at about nine fifty in the morning, and then there was a third shock at about nine fifty five. This earthquake destroyed churches and monasteries all over Lisbon, as well as the royal palace. A large fissure opened up in the city center. People trying to flee the destruction and the fires, made their way to the Taugus River and to the boats in the harbor to try to escape, but at about ten thirty, so less than an hour after the earthquake started. The water receded and then returned as a tsunami that flooded the harbor and much of the central city, which had been built over what had been a dry creek bed. Many of the people who had sought safety in the water drowned or were crushed by debris and wreckage in the water. A major aftershock struck at about eleven am. As we mentioned earlier, Lisbon had a sizeable community of British subjects living in the city, and one of them was Anglican vicar Richard Goddard, who had gone to Lisbon for his health and to check on his younger brother, who was working as a merchant. After this aftershock, a group of more than one hundred people, apparently believing that the earthquake was some kind of divine retribution forcibly, baptized Goddard into the Catholic Church.

00:19:30
Speaker 1: Between the earthquake, the tsunami, and the fires, roughly four fifths of central Lisbon was completely destroyed. Only about three thousand of Lisbon's homes were in usable condition afterward. Of the city's forty churches, thirty five were destroyed. The Royal Palace, as we mentioned, was destroyed, including the Royal Library and all of its records. So was the Opera House, which was only about a month old at this point. The Customs House was destroyed, along with commercial buildings and banks and all of the records that all of these buildings contained. As we mentioned earlier, deathtol estimates are all over the place, but it is estimated that about thirty thousand people died in Lisbon alone. That would have been about ten percent of the population. Seventy eight people from the English factory died.

00:20:21
Speaker 2: Because Portugal had an established British community, there was a lot of documentation and writing about the earthquake and its aftermath that was written in English. Some of this was published in the UK in seventeen fifty five or not long after. This is one of the reasons that the earthquake is most associated with Lisbon. In addition to Lisbon's importance as the Portuguese capital and the just immense scale of the disaster there, there was also a lot of writing about it that was very quickly accessible to people in Britain and the Americas and then anywhere else that was translating these British documents. There is also a lot of documentation of the earthquake that is written in Portuguese, and we'll get to that after we pause for a sponsor break. In seventeen fifty five, Jose the First was King of Portugal. He was at a royal residence in Blame in western Lisbon when the earthquake struck. This palace did have some damage, but the Blame area was not affected nearly as badly as central Lisbon, and the king was unharmed. Pedro Demota Isilva, secretary of State for the kingdom, also survived, but he was in his seventies and sick. He died only a few days after the earthquake. I don't think he died as a result of the earthquake. I think he was already ill, but it's a little unclear in the sources that I read. Sebastian Jose de Cavalo Imelo, secretary of State for Foreign Affairs and War, was also unharmed. The king gave Sebastiao Jose broad authority to manage the official response to the earthquake, and after Pedro Damota y Silva's death, he became Secretary of State for the Kingdom. Later on in his life he became Marquess de Pombal, and most sources just call him Pombal, regardless of when in his life they're talking about. Sources give a range of reasons for why Pombal wound up in this role. One is that being the Secretary of State for Foreign Affairs and war made Pimo logical choice to be in charge. The damage to Lisbon could be compared to a massive enemy bombardment in a time of war. I also saw one argument claiming that it was because his house had been completely spared, and people interpreted this as divine intervention and a sign that he should be put in charge. I don't know how much truth there is to that. Another made it sound like he was just the one who took the initiative to do it, that he left his family at home almost immediately after the earthquake had stopped and went to find the king and find out what the king wanted him to do.

00:23:16
Speaker 1: Regardless, Pombal's involvement is a big part of why the Great Lisbon earthquake is sometimes described as the first modern disaster, because it had a well documented, coordinated government response. The king and his government, largely directed by Pombal, took accountability for the rebuilding effort and for helping as many people as possible during the aftermath of the earthquake, tsunami, and fires, and minimizing harm as much as possible. There's a probably apocryphal but widely repeated story that the king asked Pombal what to do, and Pombal answered, quote, bury the dead and feed the living. So Pombal did not do all of this by himself. There were also twelve district leaders appointed, and they had very broad authority to make decisions to manage the emergency in each of their districts. And then, of course there were all kinds of other managers and workers and other people who were all part of the effort. They were also guided by a set of two hundred and forty one measures and provisions drafted by Pombal and signed by the king. These were later published as a book, and they included everything from reducing the spread of disease to finding and distributing food, to providing medical treatment and other care. Some taxes were suspended to help people afford necessities, while all of this work was funded by a newly established tax on trade. As part of the relief effort. The government also nationalized the canned sardine industry. Food and other provisions came from a range of sources. Ships that were already in the harbor that were not destroyed in the tsunami were forbidden to leave until it was confirmed that they were not carrying cargo that could help with the rebuilding effort. Taxes on fish were suspended, and people were also encouraged to fish to try to bolster the food supply. The British government sent monetary aid, as well as loads of shovels and pickaxes and food, which is one of the first known instances of formal international disaster aid in history. A tent city was established at the royal estate in Belem, and while the palace was undergoing repairs, the king lived on the grounds as well. Pombal also lived in a hut in Belem, even though his home was apparently intact.

00:25:42
Speaker 2: During the recovery effort, Lisbon existed basically in a state of martial law. Looters and smugglers were aggressively captured and prosecuted, and a lot of them were hanged. The government implemented price controls so that there would be no price gouging. People who mass created as monks or nuns to try to get free provisions were excommunicated from the Catholic Church. The government also tried to keep people from simply fleeing Lisbon and leaving the city without anybody still there to help care for other people and to help rebuild, and they ignored various requests from the wealthy to try to get special treatment or extra help. We mentioned earlier that one of the reasons that it's hard to determine an accurate death toll for this disaster is that the dead were buried very quickly to try to prevent the spread of disease. Some people were buried in mass graves, and others were weighted down on barges which were then sunk, basically burying them at sea. These mass burials included people across the spectrum of race, ethnicity, age, and social status. This was of course controversial, especially since most of these people had died suddenly and had not had an opportunity for a final confession or last rights. Pomball and the rest of the government also established a plan to rebuild central Lisbon. It had previously been a medieval city with some public plazas, but also a lot of very narrow, winding streets that had been built and expanded haphazardly over the centuries without any kind of official plan. The new construction was planned out on an orthogonal grid, with wide streets that would also act like fire breaks. The new buildings were also designed to be earthquake resistant. They featured what came to be known as the guiola pombalina or pombaline cage. This was an interior support structure made of wood with a lot of wooden cross bracing. The inside of this structure was filled with small stone masonry that could move and shift in the event of earthquakes. Masonry facades were designed to slide down the side of the building in the event of an earthquake, rather than toppling out to the street. Decorative elements were mostly tile adornments and iron balconies. These newly built buildings were typically between three and five stories tall, with shops and services on the ground floor and housing above.

00:28:15
Speaker 1: All of this.

00:28:16
Speaker 2: Rebuilding took a very long time. The rebuilt central city had two main squares, the Prosa de Commercio and the Prosaderosio. The Prosida Commercio faces the harbor and its surrounded by buildings that mostly house things like government offices and courts. In seventeen seventy five, so twenty years after the earthquake, an equestrian statue of King Jose the First was dedicated at this square, and a lot of the surrounding construction sites were draped with cloth or framed in wood that was decorated to look like what the finished buildings would be. It was still really a construction site. Even all of the official steps to try to recover from the earthquake, it was still, of course a major disaster. It's estimated that Portugal lost between a third and half of its gross domestic product because of the earthquake. Wages and prices were also volatile for years afterward. The scale of the earthquake and the recovery effort also slowed Portugal's colonial efforts in the Americas. We also mentioned that there's a lot of documentation of this earthquake from British subjects who were living in Lisbon and elsewhere in Portugal. There's also documentation from other foreign residents and visitors, and there is a ton of Portuguese documentation as well. In January of seventeen fifty six, Pombal sent a set of thirteen questions to Portugal's bishops, with instructions to pass those questions on to their parish priests and then collect all the answers. They were specific questions about the quake itself, like what time the tembler started, how long they lasted, how many waves of shaking there were, and how far apart those waves were. He asked whether the shaking seemed to come from a specific direction. There were also questions about how many people died and how many homes were destroyed, as well as local relief efforts and whether they had faced any kind of shortages. Because of this systematic collection of information about the earthquakes and the types of questions that were asked, Pombal is also recognized as contributing to the field of seismology. This earthquake also happened alongside a lot of intellectual and societal change in Europe near the start of the period that is described as Europe's Age of Enlightenment or the Age of Reason. This period is known for scientific discoveries with a focus on rational thought and empirical evidence and a shift away from looking for religious or divine explanations for natural phenomena. There's been a lot of writing about how the earthquake and its aftermath were related to this and how they influenced people's thinking about nature, religion, and science. Like the earthquake struck a Catholic country and destroyed a lot of churches on a holiday while people were at mass.

00:31:19
Speaker 1: What did that mean? Was this divine retribution? And if it was, what was it retribution for? Or was it just a coincidence, a natural disaster with an explanation that could be found in nature that didn't have any kind of underlying religious meaning.

00:31:36
Speaker 2: As we sat up at the top of the show. This earthquake is also part of Voltaire's satirical work Candid. One of the many things that Candide satirizes is the philosophy of optimism, including the work of German philosopher Gottfried Wilhelm Leibnitz in his seventeen ten work The Odyssey. On an incredibly basic level, this philosophy is root in the idea that the world is the best possible world that God could have created, and it was hard for people to reconcile that idea with the earthquake. In Candid, Candid's tutor, doctor Pangloss, insists repeatedly that they are living at the best of all possible worlds. He says this no matter what horrific thing is happening around them, including the earthquake. Voltaire also wrote a poem that was explicitly about the earthquake and the axiom to ebien.

00:32:33
Speaker 1: Or all as well. At the same time, some of the writing about this makes it sound very X plus Y equal Z, summing it up along the lines of people couldn't reconcile this terrible earthquake killing people in the middle of church with the idea of God, especially with the idea of a benevolent God. So voila the Enlightenment. But that's incredibly reductive. The Age of Enlightenment is a frie historians have developed to try to understand and talk about the past. And it wasn't like a light switch. Nobody was like, let's start the Enlightenment. You guys, I woke up this morning and I was in the age of reason. How about you? I felt enlightened, and I want more people to feel that too. The changes and developments that have led historians to frame this period in this way started before the earthquake, and they were building on the scientific revolution that had started centuries earlier. Also, there are a lot of differing opinions about poem Mall. He definitely had a huge influence on the recovery from the earthquake in Lisbon and the rest of Portugal, and some of the steps that the Portuguese government took to try to mitigate this disaster are still things that continue to be done after disasters today. But he is also described as really overstepping his authority, just going way beyond what was needed to recover from the earthquake, so that he could try to push his more personal agenda, including his own opposition to the Jesuit order. There is so much more stuff that went on there, we would need a whole other episode and honestly a way more thorough understanding of the entirety of Portuguese history. But when King Jose the First died in seventeen seventy seven, Pomeball immediately lost his position, and then he spent the rest of his life trying to fight off accusations of corruption and abuse of power. He died in seventeen eighty two, you got some listener mail lined up for us. I do have listener mail lined up, so this listener mail is from listener Timothy. And Timothy wrote after our episode on Rickets and wrote, sometimes I get distracted while I'm listening to podcasts and multitasking, so I apologize if I missed it. Isn't sure if in the Rickets episode you talked about the genetic disorders that can cause a person to have rickets even if they're getting plenty of sunlight. I happen to be one of these people. My dermatologists is always telling me I need to use more sunblock and stay out of the sun because of the sun damage that I have to my skin. At the same time, I am vitamin D deficient and have to take a large dose of vitamin D every week to supplement. I found out at fifty five years of age that I will just always be vitamin D deficient if I don't take a supplement. There are several genetic disorders which render humans unable to use vitamin D or synthesize vitamin D from sunlight regardless of sun exposure. This then lists off what at least some of them are. So there's hereditary vitamin D resistant rickets caused by mutations in the VDR gene. The body can't use the vitamin D it produces or consumes, leading to severe rickets, low calcium, and sometimes alopecia. Vitamin D S dependent rickets type one A caused by mutations in the CYP two seven B one gene, so the body cannot convert vitamin D to its active form, and vitamin D dependent rickets type one B vdd R one B a rarer similar defect in the CYP two R one gene. I don't know which one of these I'm affected by, because when they find out you're vitamin D deficient, it's cheaper and easier to just put you on a supplement than to do a bunch of genetic tests just to find out that you still need the supplement. I don't have a pet right now, so I'm including a picture of a wild deer that has been living in my backyard and harassing me in my family. Not only is she not afraid of people, she seems to want to attack anyone who comes into our yard. I have named her Venison, and we have had to fend off her attacks with sticks. Timothy, I don't I'm not laughing at your misfortune of having an aggressive deer in your backyard. I'm laughing because it is so incongruous with the image that a lot of people have of deer as like very peaceful, gentle animals just quietly step through the forest and eat leaves. This is a very pretty deer. I am very sorry that she is causing problems in your life. We did not mention any any genetic.

00:37:35
Speaker 2: Conditions that can cause people either not to be able to produce vitamin D or to use it. We talked more about other conditions that can cause you not to be able to absorb it from your food. So thank you so much for sending this note to talk about that, and for sending this deer picture. I have some of a fondness for deer, while also are recognizing that they can cause a number of problems due to the world we have built for them to live in. Yeah, they are wild animals. They are wild animals. There are also a whole lot of them. And as we talked about in our episode about tick born diseases, the prevalence of lime disease seems to be associated with the fact that there's a lot, a lot of deer nowadays.

00:38:29
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