《旧五代史·后梁·太祖纪一》
四月一日，魏博镇乐彦祯违背律令，他儿子乐从训逃奔到相州，派人来请求太祖派军队援助。
四月戊辰，魏博乐彦祯失律，其子从训出奔相州，使来乞师。
On 1 April, Le Yanzhen of Weibo broke the law, and his son, Le Congxun, fled to Xiang State, and asked there for troops to support him.