The khagan Yujiulü Hulü, in 414, the…

The khagan Yujiulü Hulü, in 414, the fourth year of his rule over the Rouran, is about to oversee the marriage of one of his own daughters to Feng Ba when he is overthrown by his nephew Yujiulü Buluzhen, who, along with the coup leaders, sends Yujiulü Hulü and his daughter to Northern Yan.

Feng Ba treats him as an honored guest and, as originally planned, takes Yujiulü's daughter as a concubine.

Yujiulü Hulü requests that Feng Ba send an army to escort him home and, in May 414, Feng Ba, with some reluctance, gives him an escort commanded by general Wan Ling who, according to the account, returns after having killed Yujiulü Hulü along the way.