The medieval period of Bihar saw many Muslim rulers who plundered and looted the boundaries of
Sher Khan had thwarted the Bangla and Hamayun’s ground forces with his personal Bihari regular army and some Afghani clans men, he came back strengthened and self-assuredly through his roaring attitude backwards to Bihar where he was arising versus his own Masters by acquiring the great power to defeat them. In May 1540 at Kannauj he had to experience again the mighty Mogul Emperor Humayun nonetheless thwarted him and had driven his enemies from Bengal, Bihar and the Punjab and at the equally conquered the Baluchs and their foremen on the northwesterly frontier.
Today the mausoleum of Sher Shah Suri remains standing in Sasaram,