《旧唐书·本纪·卷二十》
七月二十九日，太常礼院上奏说 ：每月初一、十五，皇帝到积善宫向皇太后请安，文武百官在宫门外进奉名帖请安。 
丙戌，太常礼院奏： 每月朔望，皇帝赴积善宫起居，文武百官于宫门进名起居。 
On the 29th day of the 7th month, the Imperial Academy of Ritual Music submitted a memorial: On the 1st and 15th day of each month, the emperor will visit the Jishan Palace to greet the empress dowager, with all of the civil and military officials presenting their cards outside of the palace to offer their greetings.