《宋史·本纪·卷四十六》
景定元年六月初六，立为皇太子，赐字长源，命杨栋、叶梦鼎为太子詹事。
景定元年六月壬寅，立为皇太子，赐字长源，命杨栋、叶梦鼎为太子詹事。
On June 6 of the first year of Jingding, he was established as the Crown Prince, granted the name Changyuan, and ordered Yang Dong and Ye Mengding to be the Crown Prince's Jianshi.