Atotoztli (Classical Nahuatl: Atotoztli [atoˈtostɬi]) or Huitzilxochtzin (Classical Nahuatl: Huitzilxōchtzin [witsiɬˈʃoːtʃtsin]) was an Aztec princess and possible regent.

The Anales de Tula and Relación de la Genealogía state she ruled the Triple Alliance herself, possibly for as long as 30 years.

On the other hand, the documents supporting these claims were not contemporary, and made on request of Juan Cano de Saavedra to support the claims of his wife Isabel Moctezuma as heiress to Tenochtitlan.

[8] It seems likely she was the tlatoani without the ordinal number, or she held authority along the lines Europeans would describe as a king's regent, because the next ruler after Moctezuma I was her son Axayacatl.

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