Xilomantzin was the tlatoani ("king") of the pre-Columbian altepetl (ethnic state) of Culhuacan in the Valley of Mexico from 1440 to 1473.
Xilomantzin was the son of Acoltzin, the previous ruler of Culhuacan, and Tlacochcuecihuatl or Tlacochcuetzin, a daughter of Tezozomoctli, ruler of Azcapotzalco.Chimalpahin (1997): vol. 2, p. 111. He succeeded his father in the year 13 Flint (1440).Chimalpahin (1997): vol. 1, p. 233. He married Izquixotzin, the daughter of Tlacateotl, ruler of Tlatelolco, and had a son named Acolmiztli.Chimalpahin (1997): vol. 2, p. 113.
In the year 7 House (1473), Xilomantzin sided with Moquihuixtli, then ruler of Tlatelolco, in a conflict against Tenochtitlan (led by Axayacatl), which resulted in both Moquihuixtli and Xilomantzin being killed.Chimalpahin (1997): vol. 1, p. 139; vol. 2, pp. 91–93, 107; Quiñones Keber (1995): pp. 221–222.
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