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On the morning of 1 November 1755, All Saints' Day, a massive offshore earthquake struck Lisbon while much of the population was at Mass. Survivors who fled to the open waterfront at the Terreiro do Paço were then hit by a tsunami surging up the Tagus. Candles and hearth fires then merged into a conflagration that burned for days, destroying palaces, churches, archives, and the royal library, and tens of thousands died.
The earthquake let Sebastião José de Carvalho e Melo, later the Marquis of Pombal, take control of the emergency response: he buried the dead quickly, hanged looters, fixed prices, and organized the rebuilding. His effectiveness in the crisis became his mandate to concentrate state power, persecute the Jesuits and the high nobility, and push through reforms that would have been impossible in normal times. Catastrophe cleared away both physical and political obstacles, so recovery turned into consolidation.
Contemporaries interpreted the destruction through competing frameworks of meaning. Clergy like the Jesuit Gabriel Malagrida preached that it was divine punishment for sin, while Voltaire and others used it to attack providential optimism. How a society explains a catastrophe decides who gains authority afterward, and so the fight over interpretation becomes a political struggle as consequential as the physical recovery.
Pombal's engineers, led by Manuel da Maia and Eugénio dos Santos, replaced medieval lower Lisbon with the Baixa Pombalina: a uniform grid of wide streets and standardized, prefabricated buildings. The buildings used the gaiola, a flexible timber cage inside the masonry designed to resist future earthquakes. Destruction turned the city into a blank slate for Enlightenment ideals of order, standardization, and early seismic engineering.