《北史·列传·卷三十九》
早些时候，孝昭帝常留济南王在邺城，任命领军库狄伏连为幽州刺史，任命斛律丰乐为领军，以分散高湛的权力。
先是，恆留济南于鄴，除领军厍狄伏连为幽州刺史，以斛律丰乐为领军，以分武成之权。
Earlier, Emperor Xiaozhao often kept King of Jinan in Yecheng, appointed Ku Difulian, the leader of the army, as the Inspector of Youzhou, and appointed Hulü Fengle as the leader of the army to disperse Gao Zhan's power.