had expanded rapidly and many provinces rebelled. Also, as the Aztec Empire was expanding and consolidating power, the Purépecha Empire in West Mexico was similarly expanding. In 1455, the Purépecha under their king Tzitzipandaquare had invaded the Toluca Valley, claiming lands previously conquered by Motecuzoma and Itzcoatl. In 1472, Axayacatl re-conquered the region and successfully defended it from Purépecha's attempts to take it back. In 1479, Axayacatl launched a major invasion of the Purépecha Empire with 32,000 Aztec soldiers. Purépecha met them just across the border with 50,000 soldiers and scored a resounding victory, killing or capturing over 90% of the Aztec army. Axayacatl himself was wounded in the battle, retreated to Tenochtitlan, and never engaged the Purépecha in battle again. In 1472, Nezahualcoyotl died, and his son Nezahualpilli was enthroned as the new huetlatoani of Texcoco. This was followed by the death of Axayacatl in 1481. Axayacatl was replaced by his brother Tizoc. Tizoc's reign was notoriously brief. He proved to be ineffectual and did not significantly expand the empire. Tizoc was likely assassinated by his own nobles five years into his rule, apparently due to his incompetence. Later years of expansion Tizoc was succeeded by his brother Ahuitzotl in 1486. Like his predecessors, the first part of Ahuitzotl's reign was spent suppressing rebellions that were commonplace due to the indirect nature of Aztec rule. Ahuitzotl then began a new wave of conquests including the Oaxaca Valley and the Soconusco Coast. Ahuitzotl conquered the border city of Otzoma and turned the city into a military outpost due to increased border skirmishes with the Purépecha. The population of Otzoma was either killed or dispersed in the process. The Purépecha subsequently established fortresses nearby to protect against Aztec expansion. Ahuitzotl responded by expanding further west to the Pacific Coast of Guerrero. By the reign of Ahuitzotl, the Mexica were the largest and most powerful faction in the Aztec Triple Alliance. Building on the prestige the Mexica had acquired over the course of the conquests, Ahuitzotl began to use the title "huehuetlatoani" ("Eldest Speaker") to distinguish himself from the rulers of Texcoco and Tlacopan. The alliance still technically ran the empire. But the Mexica Emperor now assumed nominal if not actual seniority. Ahuitzotl was succeeded by his nephew Moctezuma II in 1502. Moctezuma II spent most of his reign consolidating power in lands conquered by his predecessors. In 1515, Aztec armies commanded