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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.
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.
Although he was away from the capital, he urged Fu Jiān not to incorporate so many Xianbei officials (particularly those from Former Yan's imperial Murong clan) into his own government, a suggestion Fu Jiān did not accept.