《宋书·志·卷十四》
魏明帝初年，司空王朗建议： 古代帝王有在位年数，而无年号，汉代初年也如此。
魏明帝初，司空王朗议： 古者有年数，无年号，汉初犹然。
In the early years of the Wei Dynasty's Ming Emperor, Minister of Works Wang Lang proposed: In ancient times, emperors had the number of years they reigned but did not have reign titles, the same was true of the early Han Dynasty.