《旧五代史·后汉·列传五》
李崧的两位弟弟李屿、李山义，贪杯无识，与杨、苏逢吉的子弟在酒席之间，时常提到被剥夺的房产一事，被苏逢吉知悉。有位叫葛延遇的部下，拖欠李屿商船的资财，李屿鞭打他，逼他交还所欠资财，遇上同伙李澄也服侍苏逢吉，葛延遇夜晚在李澄家寄宿，告诉他李屿催逼的情况，于是两人在一夜间串通告发李崧叛逆。
昉闻之汗出。有部曲葛延遇者，逋李屿船佣，屿挞之，督其所负，遇有同辈李澄亦事逢吉，葛延遇夜寄宿于澄家，以屿见督情告，遂一夕同谋告变。
Li Song's two younger brothers, Li Yu and Li Shanyi, were greedy and ignorant. At drinking parties with Yang and Su Fengji's sons, they often mentioned the confiscated property, which Su Fengji learned about. A subordinate named Ge Yanyu owed money to Li Yu's merchant ship, and Li Yu whipped him to force him to repay the debt. They met an accomplice Li Cheng, who also served Su Fengji, and Ge Yanyu spent the night at Li Cheng's house, telling him about Li Yu's pressing demands. So the two of them conspired overnight to inform on Li Song's rebellion.