佛祖歷代通載 7.6

7.6

西秦乞伏國仁（本西鮮卑人。其先自漢北出陰山。後降苻堅。署為南單于鎮勇士川。苻堅既敗國仁。自稱大單于王。後號西秦。據金城僭立。四年乙酉改建義）。

Qifu Guoren of the Western Qin (originally a Western Xianbei. His ancestors came out from Yinshan north of the Han. Later he surrendered to Fu Jian, who appointed him Southern Chanyu to guard Yongshichuan. After Fu Jian's defeat, Guoren proclaimed himself King and Great Chanyu, and later named his state Western Qin, seizing Jincheng to illegitimately establish himself. In the fourth year, yiyou, he changed the era to Jianyi).