《晋书·帝纪·第二章》
三月己卯，封升文帝的爵位为王，增加封邑连同以前的共二十郡。
三月己卯，进帝爵为王，增封并前二十郡。
On Ji Mao in the third month, Emperor Wen was enfeoffed as a king, increasing the fief along with the previous one to a total of twenty prefectures.