Tezozomoc Yacateteltetl, was a Tepanec leader who ruled the altepetl of Azcapotzalco from the year 1353 or Five Reed (1367) or Eight Rabbit (1370) until his death in the year Twelve Rabbit (1426). Histories written down in the early colonial period portray Tezozomoc as a military and political genius who oversaw an expansion of Tepanec influence, bringing about Azcapotzalco's dominance in the Valley of Mexico and beyond.