He was initially the tlatoani (ruler) of Ecatepec before becoming tlatoani of Tenochtitlan, as well as its first governor under the colonial Spanish system of government. He had been designated governor (tlatoani) of Ecatépec by Moctezuma, in the year 2 Técpatl after the death of Chimalpilli the former tlatoani. Moctezuma was already a prisoner of Cortés in Tenochtitlan, the people of Ecatepec accepted him as their ruler and hid him along with his mother.
Captivity and baptism
After the fall of Tenochtitlan, he was one of the five Aztec lords held captive by Cortés along with Cuauhtemoc, the cihuacohuatl Tlacotzin, Oquiztzin, and Motelchiuhtzin. Along them he was also tortured, with his feet burned, because of the gold lost by the Spaniards when they had to flee Tenochtitlan.
Huanitzin was baptized with the SpanishChristian nameDiego. He took the surnamede Alvarado from his baptismal sponsor — probably Pedro de Alvarado or one of his brothers,[1] whose uncle with whom they came to America was named Diego de Alvarado.
Governor of Tenochtitlan
Cortés took Huanitzin along with many other indigenous rulers in his travel to Honduras. He was spared from execution when Cuauhtemoc was hanged by Cortés along with Tetlepanquetzatzin, tlatoani of Tlacopan and don Pedro Cohuanacochtzin. After the return of Cortés, Huanitzin was released and returned as Tlatoani of Ecatepec, where he ruled 14 years.
As the grandson of a former Tlatoani, in the year 7 Tochtli (1538), he was chosen as the first governor of Tenochtitlan (Mexico), by the don Antonio de Mendoza, first viceroy of México. Tenochtitlan had been without official ruler for almost a year.
Lockhart, James (1996) [1992]. The Nahuas After the Conquest: A Social and Cultural History of the Indians of Central Mexico, Sixteenth Through Eighteenth Centuries. Stanford: Stanford University Press. ISBN0-8047-2317-6. OCLC24283718.