Who was the king who walked three times round the bed of his ailing son and prayed to God. ' Give me my son and take my life instead of him'?

Babar, the founder of the Mughal Empire in India, walked three times around the bed of his sick son Humayun and prayed to God to exchange his own life for his son's recovery. This incident is recorded in the Baburnama and reflects both his deep fatherly affection and his religious devotion. Humayun eventually recovered, though Babar himself died shortly after.