《资治通鉴·晋纪·晋纪三十九》
庚子，河西一带的胡族首领刘云等人统率几万户投降北魏。
庚子，河西胡刘云等帅数万户降魏。
On Gēnzǐ day, Liu Yun and other leaders of the Hu nationality in Hexi led tens of thousands of households to surrender to the Northern Wei Dynasty.