The name of Althualpa's half-brother is:
The war for the Inca throne.
After the death of Huayna Cápac and the one who would be the successor to the throne Ninan Cuyuchi, the Sapa Inca throne needed a new ruler, before which Atahualpa's half-brother, Huáscar, declared himself the new Inca of Tahuantinsuyo in 1527.
After knowing this, a civil war between Atahualpa and Huáscar began that lasted five years, after which Atahualpa won and was crowned as the new ruler in 1532, however, his reign would not last long due to the arrival of Francisco Pizarro.
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