《宋史·本纪·卷十九》
徽宗体神合道骏烈逊功圣文仁德宪慈显孝皇帝，名估，神宗的第十一个儿子，母亲是钦慈皇后陈氏。元丰五年，以平江、镇江军节度使职衔封为端王，接受师傅的指导，在宫中学习。
绍圣三年，以平江、镇江军节度使封端王，出就傅。
Emperor Huizong Tishenhedao Junlie Xungong Shengwen Rendexian Ci Xianxiao, named Gu, was the eleventh son of Emperor Shenzong, and his mother was Empress Chen of Qinci. In the fifth year of Yuanfeng, he was named the King of Duan with the title of Pingjiang and Zhenjiang Army Jiedushi, and he received guidance from the master and studied in the palace.