《旧唐书·列传·卷一百三十四》
惠昭太子去世，承璀提出主张请求立澧王宽为太子，宪宗没有采纳，而立遂王宥。
惠昭太子薨，承璀建议请立澧王宽为太子，宪宗不纳，立遂王宥。
After the crown prince Huizhao passed away, Cheng Cui gave a statement to request to establish Li Kuang, the king of Li, as the crown prince, but Emperor Xianzong didn't adopt his request, and established Li You, the king of Sui, as the crown prince.