Who was the ruler of the Aztec empire during the fifteenth century?

The ruler of the Aztec Empire during the fifteenth century was Montezuma II, who reigned from 1502 to 1520. He is known for expanding the empire to its greatest territorial extent and for his encounters with Spanish conquistador Hernán Cortés. Montezuma's reign was marked by significant cultural and economic developments, but it ultimately ended with the Spanish conquest of the Aztec Empire.