《宋书·本纪·卷一》
于是派遣敬宣前往桓玄那裹。担玄攻克京城，杀五显，任命牢之为会稽内史。
遂遣敬宣诣玄，玄克京邑，杀元显，以牢之为会稽内史。
Then he sent Jing Xuan to Huan Xuan. When Xuan attacked and captured the capital and killed Wu Xian, he appointed Rao as the History of Kuaiji.