Montezuma II (c. 1466 - 29 June 1520) was the ninth ruler of the Tenochtitlan, ruling the city-state from 1502 until his death in 1520 during the Spanish conquest of the Aztec Empire in what is now modern-day Mexico.
In the Robot Chicken episode, he gets killed after Hernán Cortés stabbed him in the heart, he's now a one headed Ghost who is taking Revenge on various people for unknown reasons.