Huayna Capac (wĪˈnä käˈpäk) [key], d. 1525, Inca of Peru, last of the great emperors. The Inca empire reached its greatest extent and power under his rule, but disruptive forces were already at work. Their action was hastened by Huayna Capac's decision to divide the empire by leaving the recently conquered kingdom of Quito to his favorite son, Atahualpa, and the rest to the legitimate heir, Huáscar. War between the brothers had just ended when Francisco Pizarro began his conquest. Huayna Capac's third son, Manco Capac was the last Inca to succumb to the Spanish.