《资治通鉴·陈纪·陈纪九》
庚子，隋文帝颁下诏令，百官大臣凡在前代北周所受封的官品爵位，都仍旧不予降低。
庚子，隋诏前代品爵，悉依旧不降。
Gengzi (the first day of the tenth lunar month), Emperor Wen issued an imperial edict stating that all ranks and titles bestowed in the former Northern Zhou Dynasty would be retained.