Sher Shah was son of a Jagirdar under the kingdom of Jaunpur.
His father Hasan Khan Sur held the jagir of Sasaram in Bihar during the rule of Lodis.
Sher Shah helped his father in the administration of his jagir.
Later he developed differences with his father and left him.
He served under Afghan nobles.
After the death of his father in 1524 he was given his father’s jagir by Ibrahim Lodi.
He gradually increased his influence and defeated Sultan Mahmud Shah of Bengal.
He emerged as the most powerful military commander in the eastern provinces.
Sher Shah continued consolidating his position in Bihar.
He succeeded in establishing himself as the most powerful Afghan chief in Eastern India.