Sagar Singh was the estranged son of Udai Singh. Sagar's father began to move farther awar from Sagar and his brother Shakti, and began to give love to Maharana Pratap, his other son. Soon, Mughal Empire leader Akbar the great marched out to defeat Mewar. Seeing that their brother should be forsaken, Sagar and his brother Mir Shakti Singh defected to Akbar before the Battle of Haldighati.