《汉书·传·韩彭英卢吴传》
等到俘虏了臧荼，就下达韶书，诏令将相列侯们选择群臣中有功劳的封为燕王。
及虏臧荼。乃下诏，诏诸将相列侯择群臣有功者以为燕王。
When Zang Tu was captured, an imperial decree was issued, ordering the ministers and vassals to choose one of the ministers with military merit to be made King of Yan.