《旧唐书·列传·卷五十八》
开元年间，皇上诏令汇集逃散的官员，圆参加射策形式的考试选上，授予执戟。
开元中，诏搜访遗逸，圆以钤谋射策甲科，授执戟。
During the Kaiyuan Era, the Emperor issued an order to gather disbanded officials. Yuan took part in the examination for skill in archery and was selected, and was awarded the rank of Deputy Commander of the Imperial Bodyguard.