[1] He allied with Spain during the Spanish conquest of the Aztec Empire and assisted Hernán Cortés during the Siege of Tenochtitlan.
On the arrival of the Spaniards, the young leader sent an embassy to Hernán Cortés while he was at Tlaxcala, offering him his services and asking his aid in return.
Afterward he took great interest in the propagation of Christianity, and supposedly brought in a bag the first stones to build the church of the convent of San Francisco in the city of Mexico.
[4] In the 17th century, Fernando de Alva Cortés Ixtlilxóchitl, his great-great-grandson, penned a history of Tetzcoco called the 13th relation of the Historical Compendium of the Kingdom of Texcoco, which defended Ixtlilxochitl and his actions.
In order to gain rights and privileges from the Spanish monarch, whose power had grown much over the previous century, is careful to depict Ixtlilxochitl as one of the first converts to Christianity in the Americas.