Montezuma's treasure is a legendary buried treasure that is said to be located in the Casa Grande ruins. For 500 years, the treasure, which is said to be worth billions today, has been missing. The ruler of the Aztec Empire was Montezuma II, the ninth emperor. During his reign, the Aztec Empire grew in size, power, and wealth. The Spanish soldiers locked the Aztec noblemen and warriors inside the Great Temple and murdered them.