佛祖歷代通載 9.96

9.96

周太祖文皇帝（小字黑獺。郡代武川人。其先出于炎帝之後。炎為黃帝𪰜。子孫遁居朔野。有裔孫普回。狩得玉璽三細。文曰。皇帝璽。回以為天授。俗謂天文曰宇。乃遂以國號宇文并以為姓。後廢齊即位焉）。

Emperor Wen, Taizu of the Zhou (infant name Heita, a man of Wuchuan in Dai Commandery. His ancestry derived from the descendants of Emperor Yan. Yan was defeated by the Yellow Emperor, and his descendants fled to live in the northern wilds. There was a descendant named Puhui, who while hunting obtained a jade seal with three cords, inscribed: "Emperor's Seal." Puhui considered it bestowed by Heaven. In their vernacular, heavenly signs were called "yu," so they took it as their state title, Yuwen, and also as their surname. Later he deposed Qi and ascended the throne).