 The Tenochtitlan "tlatoani" Acamapichtli was a grandson of Coxcoxtli.Nevertheless, in 1377 Azcapotzalco subdued Culhuacán in large part with Aztec troops.In 1428, the Mexican Tlatoani Itzcóatl helped to overthrow Azcapotzalco's hegemony, and accepted the title "Ruler of the Culhua".