Mamluk rule

The weak successors of Iltutmish enabled the local governors to declare their independence. Bengal was sufficiently remote from Delhi that its governors would declare independence on occasion, styling themselves as Sultans of Bengal. It was during this time that Bengal earned the name "Bulgakpur" (land of the rebels). Tughral Togun Khan added Oudh and Bihar to Bengal. Mughisuddin Yuzbak also conquered Bihar and Oudh from Delhi but was killed during an unsuccessful expedition in Assam. Two Turkic attempts to push east of the broad Jamuna and Brahmaputra rivers were repulsed, but a third led by Mughisuddin Tughral conquered the Sonargaon area south of Dhaka to Faridpur, bringing the Sen Kingdom officially to an end by 1277. Mughisuddin Tughral repulsed two massive attacks from the sultanate of Delhi before finally being defeated and killed by Ghiyas ud din Balban.