《资治通鉴·晋纪·晋纪五》
太子到了许昌，给妃子王氏去信，陈述自己被诬陷冤枉的经过，而妃子的父亲王衍不敢把信上报惠帝。
太子至许，遗王妃书，自陈诬枉，妃父衍不敢以闻。
When the Crown Prince arrived in Xuchang, he wrote to his concubine Wang, stating that he had been falsely accused and wronged, but Wang's father, Wang Yan, dared not report the letter to Emperor Hui.