《元史·本纪·卷七》
二十一日，把北京、中兴、四川、河南四个路的行尚书省改为行中书省。
庚辰，改北京、中兴、四川、河南四路行尚书省为行中书省。
On the 21st day, the four Circuit Executive Administrative Offices of Beijing, Xingzhong, Sichuan, and Henan were changed to Circuit Central Secretariat Offices.