an ethnic group, the Tepanecs; arrived in the Valley of Mexico in the late 12th or early 13th centuries; their leader, Acolnahuacatl, took over leadership of Azcapotzalco; their subsequent leader Tezozomoc of Azcapotzalco ruled at the height of their influence, especially extending it over such places as the Valley of Toluca and in Morelos (see attestations)
Don Antonio cortes totoquihuaztli telpochtli Gouernador catca tlacopa (...) ca ҫan miec netequipacholli oquimopialiaya yehuatl ynic omomiquilli quiteylhuiyaya yn imacehualhuan tepaneca tlacopaneca = don Antonio Cortés Totoquihuaztli the younger, who was governor in Tacuba (...) had many worries, and that was what he died of; his vassals the Tepaneca of Tacuba had been making complaints about him (central Mexico, 1614)