We know so much about the conquest because it is among the best documented events in world history from multiple points of view. There are accounts by the Spanish leader Cortés and multiple other Spanish participants, including Bernal Díaz del Castillo. There are indigenous accounts in Spanish, Nahuatl, and pictorial narratives by allies of the Spanish, most prominently the Tlaxcalans, as well as Texcocans and Huejotzincans, and the defeated Mexican themselves, recorded in the last volume of Bernardino de Sahagún's General History of the Things of New Spain.