The Inca people began as a tribe in the Cuzco area around the 12th century. Under the leadership of Manco Capac, they formed the small city-state of Cuzco (Quechua Qusqu'Qosqo). In 1438, they began a far-reaching expansion under the command of Sapa Inca (paramount leader) Pachacuti-Cusi Yupanqui, whose name literally meant "earth-shaker". The name of Pachacutec was given to him after conquering over the Tribe of Chancas (modern Apurimac). During his reign, he and his son Tupac Yupanqui brought much of the Andes mountains (roughly modern Peru and Ecuador) under Inca control.