The childhood name of Song Wudi, Liu Yu (356-422 CE) was Jinu. On the first evening after his birth, a splendid auspicious light penetrated the chamber. In his days of poverty and hardship, he arrived at the Zhulin Temple in Jingkou, lying down in the classroom, where there appeared the imperial dragon emblem in bright colours; the monks of the temple were astonished by it. Where the emperor halted and resided, people often saw a pair of small dragons, like the yi bird in appearance. Later, when he attacked Dixinzhou, there was a huge serpent, several zhang (c.3.33m) in length, and the emperor shot and wounded it. The following day, on returning there, he suddenly heard a sound like a mortar and pestle, and the emperor went to observe this, seeing several youths all dressed in (servants’) dark robes, pounding medicine among the thick vegetation. The emperor questioned them, and a youth said: “Our king turned into a snake and went out, but was shot by Liu Jinu, so we are preparing medicine to help him.” The emperor said: “The king can then be immortal, why did he not kill?” The youth said: “The king Jinu cannot be killed. He is marked by the Heavenly Mandate; how can he be killed?” The emperor shouted at them, and all fled. He took all the medicine and returned, using it to treat wounds from metal, and none so treated did not recover. Now the Bencao calls this Liu Jinu, and this name is taken from Wudi.
Anon., Huhai xinwen yijian xuzhi, 前1.2-3 (Tale 2):
 Here yi 翼 refers to a bird described in Shanhaijing, which, having a single wing, can only fly in pairs.
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.), Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986).