Moquihuixtli.

Headword: 
Moquihuixtli.
Principal English Translation: 

the fourth ruler of Tlatelolco (see the Florentine Codex); he was a Chichimeca (see Historia Tolteca-Chichimeca), which may explain why his name is difficult to decipher in Nahuatl; he declared war on Axayacatzin; so did Xilomantzin of Colhuacan; both Moquihuixtli and Xilomantzin were killed by Axayacatzin (central Mexico, seventeenth century)
Codex Chimalpahin: Society and Politics in Mexico Tenochtitlan, Tlatelolco, Culhuacan, and Other Nahuatl Altepetl in Central Mexico; The Nahuatl and Spanish Annals and Accounts Collected and Recorded by don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, eds. and transl. Arthur J. O. Anderson and Susan Schroeder (Norman: University of Oklahoma Press, 1997), vol. 2, 106–107.

Orthographic Variants: 
Moqujujxtli, Moquiuixtli, Moquihuix
Attestations from sources in English: 

Moqujujxtli, ic nauj tlatocat in tlatilulco: chicunauhxiujtl, ipã impoliuh tlatocaiotl tlatilulco, inic çan mococolique in jtex axaiaca tlatoanj tenochtitlan. = Moquiuixtli [was] the fourth, and ruled Tlatilulco nine years. In this time the reign of Tlatilulco came to an end; for he and his brother-in-law, Axayacatl, ruler of Tenochtitlan, quarreled.
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 8 -- Kings and Lords, no. 14, Part IX, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1951), 7.

Moquihuixtli, ruler of Tlatelolco, and Xilomantzin, ruler of Culhuacan, were inciting each other to war. Therefore, Axayacatl, ruler of Tenochtitlan, had Xilomantzin killed.
Codex Chimalpahin: Society and Politics in Mexico Tenochtitlan, Tlatelolco, Culhuacan, and Other Nahuatl Altepetl in Central Mexico; The Nahuatl and Spanish Annals and Accounts Collected and Recorded by don Domingo de San Antón Muñón Chimalpahin Quauhtlehuanitzin, eds. and transl. Arthur J. O. Anderson and Susan Schroeder (Norman: University of Oklahoma Press, 1997), vol. 2, 90–91.

Attestations from sources in Spanish: 

yn chichimecatl y moquiuix yn tlamaceuani = el chichimeca [teuhctli] Moquiuix, el fundador (Quauhtinchan, s. XVI)
Historia Tolteca-Chichimeca, eds. Paul Kirchhoff, Lina Odena Güemes, y Luis Reyes García (México: CISINAH, INAH-SEP, 1976), 210.