《宋书·本纪·卷五》
元嘉十五年春二月五日，任命平东将军吐谷浑慕容延为镇西将军、秦河二州刺史。
十五年春二月丁未，以平东将军吐谷浑慕容延为镇西将军、秦河二州刺史。
On the 5th day of February in the fifteenth year of Yuanyou, Murong Yan, the General of Pingdong, was appointed General of Zhenxi and Governor of Qinhe Province.