《旧唐书·本纪·卷一》
大业初年，高祖做荥阳、楼烦二郡太守，召为殿内少监。
大业初，为荥阳、楼烦二郡太守，征为殿内少监。
At the beginning of the great cause, Emperor Gaozu served as the prefect of Xingyang and Loulou counties, and was called to the palace to be a young supervisor.