Inca Empire Expansion (1410s)

Timeline

1. 1411–1415Cuzco · PeruSapa Inca Viracocha reformed royal power and the priestly system at Cuzco, strengthened the worship of the Temple of the Sun, and used royal marriages to win over neighboring ayllu clans, providing political and religious legitimacy for outward expansion.
2. 1415–1418Urubamba Valley · Cuzco RegionInca armies advanced north along the Urubamba River, conquering or absorbing several local chiefly territories, imposing mit'a labor and terrace agriculture, and bringing the Sacred Valley under direct imperial control.
3. 1418–1420Eastern shore of Lake Titicaca · PunoInca power extended to the eastern shore of Lake Titicaca and the Collao plateau, establishing suzerain-vassal relations with chiefdoms on the lake and its southern shore. This phase of expansion paved the way for Pachacuti's later unification of the southern highlands and conquest of coastal kingdoms such as Chimú.