In the early 15th century, Tezozomoc brought the Tepanec to their height of power; at that point they controlled nearly all of the Valley of Mexico as well parts of the Toluca and Morelos valleys.
Tezozomoc (also Tezozómoc, Tezozomoctli, Tezozomoctzin) was a Nahuatl male name.
Xico was conquered by the Aztec Tezozomoc in 1381, after which groups of Mexicas settle here extending the chinampa farming system in the 14th and 15th centuries.
Upon his death, Tlacacuitlahuatzin was succeeded by Tzihuactlayahuallohuatzin, a son of Tezozomoc, the ruler of Azcapotzalco.