《新唐书·本纪·卷四·则天皇后 中宗》
二十八日，相王府长史姚元之兼掌夏官尚书、加同凤阁鸾台三品。
壬午，相王府长史姚元之兼知夏官尚书、同凤阁鸾台三品。
On the 28th, the head of the Prince's Mansion, Yao Yuanzhi, was also in charge of the Minister of the Xia Guan, and added to the same Phoenix Pavilion and the Third Grade of the Fengge Pavilion.