Mexicaltzingo (Mesicalsingo)
A town on the southern causeway between Iztapalapa and Tenochtitlan, built mostly out in the lake, which Cortés passed on November 8, 1519. Gayangos identifies Cortés's Mesicalsingo with it.
Today: Mexicaltzingo, Iztapalapa, Mexico City, Mexico
Iztapalapa, the Causeway and the City on the Lake
Hernán Cortés, second letter to Emperor Charles V, October 30, 1520 (Iztapalapa, the entry into Tenochtitlan and the city on the lake) · dated October 30, 1520; printed at Seville, 1522 (describes November 7–8, 1519, and the city as Cortés saw it in 1519–1520)
Otro dia después que á esta ciudad llegué me partí, y á media legua andada entré por una calzada que va por medio desta dicha laguna dos leguas, fasta llegar á la gran ciudad de Tenuxtitan, que está fundada en medio de la dicha laguna; la cual calzada es tan ancha como dos lanzas, y muy bien obrada, que pueden ir por toda ella ocho de caballo á la par, y en estas dos leguas de la una parte y de la otra de la dicha calzada están tres ciudades, y la una dellas, que se dice Mesicalsingo, está fundada la mayor parte della dentro de la dicha laguna, y las otras dos, que se llaman la una Niciaca y la otra Huchilohuchico, están en la costa della, y muchas casas dellas dentro en el agua.
The day after I reached this city I left it. After half a league I entered a causeway. It runs two leagues through the middle of the lake, all the way to the great city of Tenuxtitan, which stands in the middle of the lake. The causeway is two lances wide and very well built; eight horsemen can ride abreast along its whole length. Along these two leagues, on one side of the causeway or the other, stand three cities. One of them, called Mesicalsingo, is built mostly out in the lake. The other two, called Niciaca and Huchilohuchico, stand on its shore, with many of their houses out in the water.