In al - Mansur Abu Bakr 's place , Qawsun installed an - Nasir Muhammad 's infant son , al - Ashraf Kujuk as sultan .
In al - Mansur Abu Bakr 's place , Qawsun served as his regent .
In al - Mansur Abu Bakr 's place , Qawsun installed an - Nasir Muhammad 's infant son , al - Ashraf Kujuk as sultan and served as his regent .