《资治通鉴·梁纪·梁纪十四》
该城的守将北豫州刺史高永乐，是高欢族兄的儿子，与高敖曹有怨仇，关紧城门不放高敖曹进去。
守将北豫州刺史高永乐，欢之从祖兄子也，与敖曹有怨，闭门不受。
The city's defender, Bei Yuzhou governor Gao Yongle, was the son of Gao Huan's cousin and had a grudge against Gao Aocao, and closed the city gate to keep Gao Aocao out.