Hernán Cortés (also spelled Cortez), Marqués Del Valle De Oaxaca (1485-1547) was a Spanish adventurer and conquistador (he was also a failed law student) who overthrew the Aztec empire and claimed Mexico for Spain (1519-21).
Cortes sailed with 11 ships from Cuba to the Yucatan Peninsula to look for gold, silver, and other treasures. Hearing rumors of great riches, Cortés traveled inland and "discovered" Tenochtitlan, the capital of the Aztec empire. He then brutally killed the Aztec emperor Montezuma and conquered his Aztec Empire of Mexico, claiming all of Mexico for Spain in 1521. Treasures from the Aztecs were brought to Spain, and Cortés was a hero in his homeland. Cortés was appointed governor of the colony of New Spain, but eventually fell out of favor with the royals. He then returned to Spain where he died a few years later.