Early pre-Hispanic history refers to the area around the Cerro de Xico and the Island of Xico as most of the modern city was underwater until relatively recently. The area was mostly fishing villages from 900 BC to 100 AD. However, from 550 to 650, the area was dominated by the Teotihuacan culture. From 650 to 750, an Otomi settlement gained prominence. The Acxotecas arrived around 1328, the same time that chinampa farming began here. Xico was conquered by the Aztec Tezozomoc in 1381, after which groups of Mexicas settle here extending the chinampa farming system in the 14th and 15th centuries. The area was ceded to Hernán Cortés by the Spanish king in 1529. The modern area began in the 19th century when Porfirio Díaz ordered the draining of Lake Chalco which devastated the economies of the former coastline communities. The Mexican Revolution tried to compensate these communities by the creation of ejidos, the two largest here being Estación Xico with 507 hectares and San Miguel Xico with 250 hectares. These ejidos, as well as the present-day city and municipality, rest almost entirely on former lakebed.