The Mexica (Nahuatl: Mēxihkah, Nahuatl pronunciation: [meːˈʃiʔkaḁ]; singular Mēxihkatl) were a Nahuatl-speaking indigenous people of the Valley of Mexico who were the rulers of the Aztec Empire. The Mexica established Tenochtitlan, a settlement on an island in Lake Texcoco, in 1325. A dissident group in Tenochtitlan separated and founded the settlement of Tlatelolco with its own dynastic lineage. In 1521, they were conquered by an alliance of Spanish conquistadors and indigenous people including the Tlaxcaltecs led by Hernán Cortés.