These events include the weakening of the Inca Empire (prior to the Spanish conquest), the capture of Atawallpa, the Spanish conquest of Cuzco, the defeat of the Manco Inca rebellion and the execution of Tupac Amaru. Within each major event are many Weakenings of the Inca Empire. Before the Spanish conquest of Cusco in 1533, the Inca empire had been significantly weakened. The interaction between the two civilizations caused a smallpox epidemic in Tawantinsuyu, further weakening the Empire (Bungum, 2003). The Inca empire experienced an intrinsic threat to social complexity: the succession crisis. Sibling rivalry for power was a frequent occurrence due to their hereditary monarchy. Immediately before the Spanish conquest of Cusco, a violent war between the Atawallpa and Waskhar (half-brothers) engulfed the entire empire. The conflict was resolved once Waskhar and his family were murdered; however, the longevity of the war weakened the