《新唐书·列传·卷三》
那时唐朝初建，务求广封支族以镇抚天下，因此同族兄弟之子自孩童已上全都封为郡王。
於是唐始兴，务广支蕃镇天下，故从昆弟子自胜衣以上，皆爵郡王。
At that time, the Tang Dynasty had just been established and sought to establish a vast network of branches to pacify the world, so all the sons of the same brother, including children, were封made Kings of prefectures.