Acolhuacan

Acolhuacan was the polity of the Acolhua people, with its capital at Tetzcoco on Lake Texcoco. Around 1337, under Quinatzin, the Acolhua made Tetzcoco their capital in place of Coatlinchan.

In 1418 Tezozomoc of Azcapotzalco dethroned Tetzcoco's ruler Ixtlilxochitl I. Ixtlilxochitl's son Nezahualcoyotl allied with the Mexica and defeated Maxtla in 1428, after which Tetzcoco joined the Triple Alliance. In 1520 Cortés occupied the city and killed its ruler Cacamatzin; from there he launched the 1521 siege of Tenochtitlan.