Iztacalco is one of the 16 delegaciones (boroughs) into which Mexico's Federal District is divided. It is located in the center-east of the district and is the smallest of the city’s boroughs. The area’s history began in 1309 when the island of Iztacalco, in what was Lake Texcoco, was settled in 1309 by the Mexica who would later found Tenochtitlan, according to the Codex Xolotl.