《旧唐书·本纪·卷十六》
七月二十六日，因为新建成永安殿，皇帝和皇后、公主举行私宴以行乐，妃嫔们都参加了。
丙寅，以新成永安殿，与中宫贵主密宴以乐之，嫔妃皆预。
On July 26, because the Yong'an Hall was newly built, the emperor and empress, princess held a private banquet to entertain themselves, and all the concubines attended.