Nasir-ud-Din Muḥammad, better known by his regional name, Humayun, was the second emperor of the Mughal Empire, who ruled over territory in what is now Afghanistan, Pakistan, Northern India and Bangladesh from 1530–1540 and again from 1555–1556.
Defeated Humayun in the Battle of Kannauj (1540) also constructed the Purana Qila of New Delhi
On 26 June 1539, Sher Khan faced Humayun in the Battle of Chausa and defeated him. Assuming the title Farid al-Din Sher Shah, he defeated Humayun once again at Kannauj in May 1540 and forced him out of India. He also constructed the Purana Qila of New Delhi.