Assertion: empire's region | /r/HasProperty | the tepanec
Facets:
Source sentences:
text: In 1428, under their leader Itzcoatl, the Aztecs formed a three-way alliance with the Texcocans and the Tacubans to defeat their most powerful rivals for influence in the region, the Tepanec, and conquer their capital of Azcapotzalco.