Pachacuti
Rise to power

In the early 15th century, the Cusco confederation, stretching 40 kilometers around the city of Cusco, faced an invasion by the Chankas, the Incas' traditional tribal archenemies. Multiple versions of the encounter exist, the most accepted one being supported by the majority of reliable Spanish sources.

The ruler, Inca Viracocha, and his co-ruler Urco, fled the scene, while Cusi Yupanqui rallied the army, accompanied by four of Viracocha's generals, and prepared the defense of the city. During the subsequent assault on Cusco, the Chankas were repelled, so severely that legend tells even the stones rose up to fight on Yupanqui's side. At the battle of Yahuar Pampa, the Inka army won a decisive victory over the Chankas and asserted it's dominance. Cusi Yupanqui captured many Chanka leaders, who he presented to his father Viracocha for him to wipe his feet on their bodies, a traditional victory ritual. Viracocha told Yupanqui that the honor of the ritual belonged to the designated heir, Urco. Yupanqui protested and said that he had not won the victory for his brothers to step on the Chanka captives. A heated argument ensued, and Viracocha tried to have the general assassinated. Pachacuti was tipped off to the plot, however, and the assassination failed. Viracocha went into exile while Inca Yupanqui returned in triumph to Cusco, and, following a short civil war during which the co-ruler, Urco, died, was crowned Sapa Inca of Cusco, and renamed himself "Pachacuti" (meaning "Earth Shaker").
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