Perhaps the greatest known military leader of Pre-Columbian Mesoamerica, Auítzotl began his reign by suppressing a Huastec rebellion, and then swiftly more than doubled the size of lands under Aztec dominance. He conquered the Mixtec, Zapotec, and other peoples from Mexico's Pacific coast down to the western part of Guatemala. Auitzotl also supervised a major rebuilding of Tenochtitlán on a grander scale including the expansion of the Great Pyramid or Templo Mayor in 1487 (the Aztec year 8 Reed). According to some sources, he ordered over 20,000 people to be sacrificed in the dedication of the Great Pyramid.