《搜神记·卷七》
元康五年三月，吕县出现一条血流，从东到西长一百多步。那以后第八年，封云起兵攻打徐州，杀伤了几万人。
元康五年三月，吕县有流血，东西百余步，其后八载，而封云乱徐州，杀伤数万人。
In March of the fifth year of Yuan Kang, a blood flow appeared in Lüxian County, spanning more than 100 steps from east to west. In the eighth year, Feng Yun raised troops to attack Xuzhou, killing and wounding tens of thousands of people.