In the mid-16th century there was an interruption in the Mughal rule of India as Sher Shah Suri defeated Humayun and forced him to flee to Persia. Sher Shah Suri built the sixth city of Delhi, as well as the old fort known as Purana Qila, even though this city was settled since the ancient era. After Sher Shah Suri's death in 1545, his son Islam Shah took the reins of north India from Delhi. Islam Shah ruled from Delhi till 1553 when Hindu king Hemu, became the Prime Minister and Chief of Army of Adil Shah. Hemu fought and won 22 battles in all against rebels and twice against Akbar's army in Agra and Delhi, without losing any. After defeating Akbar's army on 7 October 1556 at Tughlaqabad fort area in Battle of Delhi (1556), Hemu acceded to Delhi throne and established Hindu Raj in North India for a brief period, and was bestowed with the title 'Vikramaditya', at his coronation in Purana Quila, Delhi. Hemu was defeated at the second battle of Panipat by Mughal forces led by Akbar's regent Bairam Khan, thus reinstating Mughal rule in the region.