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In February 91, he was defeated by Geng Kui during the Battle of Ikh Bayan, on an expedition sent by Dou Xian, and thence vanished from history. At the same time Hunnoi are first mentioned in the west by Tacitus as being near the Caspian Sea in 91 AD, hence the belief that Pei Chanyu might have travelled west. His younger bother Yuchujian Chanyu (reigned 91–93) was his sole heir, but was killed by generals Ren Shang and Wang Fu in 93.
See also 
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