[1] During the reign of Külüg Khan (Emperor Wuzong of Yuan), Bayan was appointed to a number of positions in the court.
After Temür's death, Qaishan emerged as the new Yuan emperor, and Bayan was among those who received an official position as a reward.
[3] In 1328 Bayan rendered great service during the enthronement of Jayaatu Khan Tugh Temür (Emperor Wenzong of Yuan).
He once suggested the emperor kill those Han people of the more numerous surnames: Zhang, Wang, Liu, Li and Zhao to suppress the rebellion.
According to Chinese historians, Toqto complained to his father that his uncle Bayan's authoritarian tendencies might bring disaster on their clan.