Hachiun (Mongolian: Хачиун), also known as Hachiun Alchi (Mongolian: Хачиун Алчи) was a full-brother of Genghis Khan and third son of Hoelun. His father was Yesügei baghatur.
Hachiun was said to have a very good relationship with his brother Hasar but a poorer one with Temüge. Of all the brothers he had the firmest relationship with Genghis.
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