The Fall of Tenochtitlan: 13 August 1521
1521 · event
On 13 August 1521 the city of Tenochtitlan surrendered after a siege of about three months. It had been the capital of the Mexica, built on an island in a lake in the valley of Mexico, connected to the shore by long causeways and fed by floating gardens. Estimates of its population run to two hundred thousand or more, which made it one of the largest cities in the world at the time. Visitors described a grid of canals, a great market, aqueducts bringing fresh water and a central precinct dominated by a twin temple.
The siege was carried out by the forces of Hernan Cortes together with tens of thousands of Indigenous allies, above all the Tlaxcalans, who had their own long conflict with the Mexica. Smallpox, brought unknowingly from Europe, had swept the city the previous year and killed a large part of its population, including the ruler Cuitlahuac. The last Mexica ruler, Cuauhtemoc, was captured as the city fell.
What followed was the systematic dismantling of the city. Its temples were pulled down and their stone used to build a Spanish colonial capital on the same site, the lake was gradually drained, and a new order was imposed on the peoples of the valley. The scale of the loss of life in the following decades, through disease above all, is among the largest recorded anywhere.
Mexico City stands on the ruins, and the ruins keep returning. In 1978 electricity workers digging near the cathedral struck a carved stone disc, and the excavation that followed uncovered the Templo Mayor, now a museum in the centre of the capital. The fall of Tenochtitlan is remembered in Mexico not as a foreign story but as the beginning of the country's own, and the survival of the Nahuatl language and of Mexica names across the modern city is part of that memory.