《北史·列传·卷三十一》
冀州刺史、京兆王元愉在信都反叛，朝廷命李平为持节、都督北讨诸军事、行冀州刺史，讨伐元愉。
冀州刺史、京兆王愉反于信都，以平为持节、都督北讨诸军事、行冀州以讨之。
The governor of Jizhou, Wang Yuanyu, the King of Jingzhao, rebelled in Xindu. The imperial court ordered Li Ping to hold the festival, supervise the northern expedition of all military affairs, and act as the governor of Jizhou to attack Yuanyu.