Aztec Conflict With Azcapotzalco (1410s)

Timeline

1. 1411–1415Valley of Mexico · MexicoTezozomoc ruled the Valley of Mexico from Azcapotzalco, with Mexica city-states like Tenochtitlan paying tribute and joining his campaigns. Within the vassal framework the Mexica expanded trade routes and the warrior class, quietly growing in strength.
2. 1415–1418Tenochtitlan · Valley of MexicoTezozomoc increased tribute demands on the Mexica states and favored his son Maxtla in succession arrangements, provoking dissatisfaction among Tenochtitlan's ruler Chimalpopoca and Texcoco's nobles. Frequent exchanges of envoys escalated diplomatic friction into precursors of armed standoff.
3. 1418–1420Texcoco · Valley of MexicoNobles such as Nezahualcoyotl of Texcoco secretly contacted Tenochtitlan, plotting to throw off Tepanec control. By around 1420 the embryonic Mexica alliance had taken shape, and the vassal order between Azcapotzalco and its vassals was on the verge of collapse.