Nezahualcoyotl

Nezahualcoyotl ordered the construction of a 16-kilometer dike across Lake Texcoco to separate fresh water from salt water and prevent flooding in Tenochtitlan. The structure, completed around 1430, functioned as an aqueduct and flood control system, demonstrating advanced engineering.

After the death of his father Ixtlilxochitl I and a period of exile, Nezahualcoyotl reclaimed the throne of Texcoco with support from Tenochtitlan. He reestablished Texcoco as a major city-state within the Triple Alliance, initiating a period of cultural and political revival.

Nezahualcoyotl led Texcoco forces in a campaign against the city-state of Chalco, a rival in the Valley of Mexico. The war ended with the defeat of Chalco and its incorporation into the Triple Alliance sphere, expanding Texcoco's influence.

Nezahualcoyotl established a library and sponsored the compilation of historical and legal texts, including the Codex Xolotl and other works. These codices recorded the history, laws, and poetry of Texcoco, preserving pre-Columbian knowledge.

Nezahualcoyotl composed several poems in Nahuatl, including 'Icuic Nezahualcoyotl' (Song of Nezahualcoyotl), which reflect on the transience of life and the search for truth. These works are among the few surviving pre-Columbian literary texts from Mesoamerica.

Nezahualcoyotl oversaw the construction of a second aqueduct from Chapultepec to Tenochtitlan, supplementing the existing one. This project improved the water supply for the Aztec capital, using a dual-pipe system that allowed maintenance without interrupting flow.