Toluca toˈluka, officially Toluca de Lerdo toˈluka ðe ˈleɾdo, is the state capital of the State of Mexico as well as the seat of the Municipality of Toluca. Toluca has a population of 910,608 as of the 2020 census. The city forms the core of the Greater Toluca metropolitan area, which with a combined population of 2,347,692 forms the fifth most populous metropolitan area in the country. Located southwest of Mexico City, the city's rapid growth stems largely from its proximity to the capital. When Toluca was founded by the Matlatzincas, its original name was Nepintahihui (land of corn). The current name is based on the Náhuatl name for the area when it was renamed by the Aztecs in 1473. The name has its origin in the word tollocan that comes from the name of the god, Tolo, plus the locative suffix, can, to denote "place of Tolo". It is also referred to in a number of Aztec codices as Tolutépetl, meaning hill of the god, Tolo, an allusion to the nearby volcano. The name Toluca de Lerdo was adopted in 1861 in honor of President Sebastián Lerdo de Tejada. The Valley of Toluca was known as Matlatzinco Valley in ancient times and home to at least four linguistic groups: the Matlatzinca, Otomi, Mazahua, and Nahua peoples. In the Postclassic period, the valley was ruled by a large powerful capital city whose ruins are located today in the village of Calixtlahuaca, just north of the city of Toluca. In 1478 the Mexica emperor Axayacatl conquered the Toluca Valley. The capital was stripped of its dynasty and power and some lands were distributed to kings and nobles from the Valley of Mexico. One of the rivals of Calixtlahuaca was Tollocan, a minor city-state before 1478. When Axayacatl destroyed Calixtlahuaca, he placed the imperial provincial capital in Tollocan. Calixtlahuaca and other towns in the Toluca Valley paid tribute to the Aztec Empire through Tollocan. After the Spanish conquest, the name Tollocan was changed to Toluca. Archaeologists have not yet located a major Postclassic settlement within the modern city.