What Aztec emperor was dethroned by Cortes in 1520?

The Aztec emperor dethroned by Hernán Cortés in 1520 was Moctezuma II. He ruled from 1502 until his capture by the Spanish conquistadors, which marked a significant turning point in the Spanish conquest of the Aztec Empire. Moctezuma's initial hospitality towards Cortés turned to tragedy as he was ultimately killed during the conflict between the Aztecs and the Spanish forces. His dethronement significantly weakened the Aztec civilization and led to its eventual downfall.