On this day, 27 January 1556 CE, the second Mughal Emperor Nasir al-Din Muhammad Humayun died after he fell headlong down the stairs, receiving a violent blow on his right temple in the Old Fort of Delhi. He ruled from 1530 to 1540 and again from 1555 to 1556. He is buried in the Tomb of Humayun in Delhi. Humayun ascended the Mughal throne in 1530 at the age of 22. Humayun was defeated by Sher Shah Suri first in the Battle of Chausa in 1539 and later in the Battle of Kannauj in 1540. After losing the battle, Humayun escaped and reached Iran in 1544, where he was granted military aid by Safavid Shah Tahmasp. In 1555, Humayun returned to India with his stronger army and met Sikandar Shah Suri at Sirhind (now in Punjab, India). He defeated Sikandar Shah in the battle of Sirhind on June 22, 1555, and recovered Delhi and Agra. Thus with this victory, he reestablished the Mughal rule in India. On 23 July 1555, Humayun once again sat on Babur's throne in Delhi.