《资治通鉴·唐纪·唐纪十一》
丙子，太宗以皇孙降生，在东宫宴请五品以上官员。
丙子，以皇孙生，宴五品以上于东宫。
On Bingzi day, Emperor Taizong hosted a banquet in the East Palace to celebrate the birth of his grandson and invited officials ranked fifth rank and above.