Since pre-Incan times, native Andean people had worshipped their ancestors, and the custom continued even after the arrival of the Spaniards in the sixteenth century. Ancestor-worship however, did not exclude members of other cultures: in fact, the Andeans welcomed outsiders as ancestors. Invaders as Ancestors examines how this unique cultural practice first facilitated Spanish colonization and eventually undid the colonial project when the Spanish attacked ancestor worship as idolatry and Andeans adopted Spanish political and religious forms to challenge indigenous rulers.