linguistic:translation, structural:summarization
Aztec omens for the conquest

In the sources recorded by Franciscan Bernardino de Sahagún and Dominican Diego Durán in the mid to late sixteenth century, there are accounts of events that were interpreted as supernatural omens of the conquest. These two accounts are full-blown narratives from the viewpoint of the Spanish opponents. Most first-hand accounts about the conquest of the Aztec Empire were written by Spaniards: Hernán Cortés' letters to Charles V, Holy Roman Emperor and the first-person narrative of Bernal Díaz del Castillo, The True History of the Conquest of New Spain. The primary sources from the native people affected as a result of the conquest are seldom used, because they tend to reflect the views of a particular native group, such as the Tlaxcalans. Indigenous accounts were written in pictographs as early as 1525. Later accounts were written in the native tongue of the Aztec and other native peoples of central Mexico, Nahuatl.

The native texts of the defeated Mexica narrating their version of the conquest describe eight omens that were believed to have occurred nine years prior to the arrival of the Spanish from the Gulf of Mexico.

In 1510, Aztec Emperor Moctezuma II was visited by Nezahualpilli, who had a reputation as a great seer, as well as being the tlatoani of Texcoco. Nezahualpilli warned Moctezuma that he must be on guard, for in a few years Aztec cities would be destroyed. Before leaving, he said that there would be omens for Moctezuma to know that what he has been told is true. Over the years, and especially after Nezhualpilli's death in 1515, several supernatural omens appeared.

The eight bad omens or wonders:

Additionally, the Tlaxcala saw a "radiance that shone in the east every morning three hours before sunrise", and a "whirlwind of dust" from the volcano Matlalcueye. According to Diaz, "These Caciques also told us of a tradition they had heard from their ancestors, that one of the idols which they particularly worshipped had prophesied the coming of men from distant lands in the direction of the sunrise, who would conquer them and rule them." Some accounts would claim that this idol or deity was Quetzalcoatl, and that the Aztecs were defeated because they believed the Spanish were supernatural and didn't know how to react, although whether or not the Aztecs really believed that is debatable.

Omens were extremely important to the Aztecs, who believed that history repeated itself. A number of modern scholars cast doubt on whether such omens occurred or whether they were ex post facto (retrospective) creations to help the Mexica explain their defeat. Some scholars contend that "the most likely interpretation of the story of these portents is that some, if not all, had occurred" but concede that it is very likely that "clever Mexicans and friars, writing later of the Mexican empire, were happy to link those memories with what they know occurred in Europe.

Many sources depicting omens and the return of old Aztec gods, including those supervised by Spanish priests, were written after the fall of Tenochtitlan in 1521. Spanish accounts tended to incorporate omens to emphasize what they saw as the preordained nature of the conquest and their success as Spanish destiny. This influenced some natives writing under the tutelage of the Franciscan friars. Other explanations include a desire to please the Spaniards or resentment toward the failure of Montezuma and Tenochtitlan warriors."