Sher Shah Suri, also known by his title Sultan Adil, was the Sultan of Hindustan, as the first Sur Emperor, from 1540 until his death in 1545. Prior to his ascension, he also served as the ruler of Bihar (1530–1540) and Bengal (1538–1540). He established the Sur Empire after defeating the Mughal Empire and declaring Delhi his seat of power. The influence of his innovations and reforms extended far beyond his brief reign, being recognized as one of the greatest administrative rulers in India. During his time in power, he remained undefeated in battle and is renowned as one of the most skillful Afghan generals in history. By the end of his reign, his empire covered nearly all of Northern India.