Moctezuma Xocoyotzin, retroactively referred to in European sources as Moctezuma II, and often called Montezuma, was the ninth emperor of the Aztec Empire, reigning from 1502 or 1503 to 1520. Through
Moctezuma depicted in the Codex Mendoza
Headdress traditionally attributed to Moctezuma II in the Museum of Ethnology, Vienna. The object, however, might not have belonged to Moctezuma and, contrary to popular belief, it was not used as his crown. It might have been a religious headdress to represent the god Quetzalcoatl during religious events, a battle standard, or a military device worn in the back.