《周书·列传·卷二十九》
当时凡另封的人，照例允许转封次子，王勇却请封兄长的儿子元兴，时人赞其高义。
时有别封者，例听回授次子，勇独请封兄子元兴，时人义之。
Usually, those who were granted new titles were allowed to transfer it to their second son. However, Wang Yong requested to grant it to his elder brother's son, Yuan Xing. Contemporaries praised him for his noble character.