Atahualpa (also Atahuallpa), the last Sapa Inca, became emperor when he defeated and executed his older half-brother Huáscar in a civil war sparked by the death of their father, Inca Huayna Capac. In December 1532, a party of "conquistadors" (supported by the Chankas, Huancas, Cañaris and Chachapoyas as Indian auxiliaries) led by Francisco Pizarro defeated and captured the Inca Emperor Atahualpa in the Battle of Cajamarca. The Spanish conquest of Peru was one of the most important campaigns in the Spanish colonization of the Americas. After years of preliminary exploration and military conflicts, it was the first step in a long campaign that took decades of fighting but ended in Spanish victory and colonization of the region known as the Viceroyalty of Peru with its capital at Lima, which was then known as "La Ciudad de los Reyes" (The City of Kings). The conquest of Peru led to spin-off campaigns throughout the viceroyalty as well as expeditions towards the Amazon Basin as in the case of Spanish efforts to quell Amerindian resistance. The last Inca resistance was suppressed when the Spaniards annihilated the Neo-Inca State in Vilcabamba in 1572.