《旧唐书·本纪·卷五》
秋七月十七日，九成宫太子新宫落成，皇上诏令五品以上官员亲族在太子宫宴会庆贺，极欢而后才罢宴。
秋七月庚午，九成宫太子新宫成，上召五品已上诸亲宴太子宫，极欢而罢。
On the 17th of July in autumn, the new palace for the Crown Prince in the Jiucheng palace was completed. The Emperor issued an edict ordering officials of the fifth grade or above and their relatives to celebrate with a banquet in the Crown Prince's palace, which ended with great joy.