Fakhruddin Mubarak Shah (1338-1349) one of the founders of an independent kingdom in Bengal with its capital at sonargaon. He assumed power on the death of the Tughlaq governor Bahram Khan (1338) of whom he was the silahdar (armour-bearer). He captured Comilla and Noakhali and extended his sway up to Sylhet in the north and Chittagong in the south (1340), and ruled over a territory comprising the whole of the eastern and southeastern part of Bengal. Having supremacy over the Padma, Meghna and Jamuna (Jumna) he fought successfully with his fleet of war-boats against Sultan alauddin ali shah of lakhnauti, checked the onrush of Haji Iliyas of southwest Bengal, and tightened his grip over the kings of Tipperah and of Arakan. 

Mubarak Shah constructed a trunk road connecting Chittagong with Chandpur opposite the outpost of Sripur, raised embankments in Chandpur, built mosques and tombs in Chittagong. ibn batuta visited Sonargaon during his region in 1346. The traveller felicitates Fakhruddin as a distinguished sovereign who loved strangers, particularly the fakirs and sufis.

The importance of Fakhruddin lies in the fact that with him started the independent sultanate of Bengal which lasted for two hundred years (1338-1538). [Muazzam Hussain Khan]