He was a son of the Former Yan Prince of Yidu, Murong Huan (慕容桓), a son of the founder of Former Yan, Murong Huang.
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Yuwen Tai was born in 507, and was a descendant of the last chieftain of the Xianbei Yuwen tribe Yuwen Yidougui, whose tribe was destroyed by Murong Huang, the founding ruler of Former Yan.