《元史·本纪·卷十七》
二十一日，把皇太子的印信授予皇孙铁穆耳，统兵于北部边境。
乙巳，以皇太子宝授皇孙铁穆耳，总兵北边。
On the twenty-first day, the crown prince's seal was granted to the imperial grandson Tiemu'er, who commanded the troops on the northern border.