Tlacopan
A town on the western shore of the lake, joined to the island city by a causeway, where the Spaniards divided their forces in 1521.
Today: Tacuba, Mexico City, Mexico
The Smallpox in Mexico, 1520
Bernardino de Sahagún and his Nahua informants, History of the Conquest of Mexico (Book XII of the General History of the Things of New Spain), edited by Carlos María de Bustamante (1829) · compiled from the 1550s to the 1570s (events of 1520–1521)
En acabándose esta pestilencia en México, vinieron los Españoles que ya estaban en Tezcuco y dejaron la laguna, y vinieron por Cuauhtitlan, hasta Tlacupan, y allí se repartieron en capitanías, y se pusieron en diversas estancias.
As this pestilence was ending in Mexico, the Spaniards, who were already in Tezcuco, came. They left the lake to one side and came by way of Cuauhtitlan as far as Tlacupan. There they divided into companies and took up different positions.