《资治通鉴·唐纪·唐纪四十九》
我问其中的原故，陛下说 皇上让我将昭靖太子的几个儿子认作我的儿子。 
臣请其故，陛下言 昭靖诸子，主上令吾子之。 
I asked the reason for this, and Your Majesty said, "The Emperor had me recognize several sons of Prince Zhaijing as my own sons."