Initially, the Aztec Empire mostly ignored the Toluca Valley, until the Purépecha Empire began to make inroads in the mid-15th century. Most of the valley was conquered by Aztec emperor Axayacatl. The Tizoc Stone depicts the emperor Tizoc defeating a warrior from the area. The first wave of conquest was in the Mazahua region in the north of the valley in 1473, followed by the conquest of Matlazinco/Tollocan in 1475. Toluca Valley town names begin to appear in Aztec records, and Matlatzinco was renamed as "Calixtlahuaca". In 1476 or 1477, the Aztecs confronted the Purépecha armies on the western edge of the Toluca Valley but were decisively defeated. Rebellion broke out in the Toluca Valley, and Axayacatl returned to reconquer the people.