《后汉书·列传·南匈奴列传》
朝廷于是又下韶书要单于迁到西河美稷居住，并派中郎将段郴和副校尉王郁留在西河保护单于，为单于设置官府、从事、掾史。
于是复诏单于徙居西河美稷，因使中郎将段郴及副校尉王郁留西河拥护之，为设官府、从事、掾史。
The court therefore issued a new edict ordering the Chanyu to move and settle at Meiji in Xihe. It also sent the General of the Gentlemen-of-the-Household Duan Chen and the Assistant Commandant Wang Yu to remain in Xihe to protect the Chanyu, and establish offices, retainers and clerks for him.