《北史·列传·卷八十四》
大业末年，天下大乱，伏允收复了他的故地，屡次进犯河右，郡县不能遏制。
大业末，天下乱，伏允复其故地，屡寇河右，郡县不能制。
At the end of the Daye reign, the country was in great chaos, Fu Yun recovered his homeland and repeatedly invaded Heyou but the counties there could not stop him.