Nadir Shah was a Persian ruler who reigned from 1736 to 1747. He is best known for his military conquests, particularly the invasion of India in 1739, where he captured the city of Delhi and looted its treasures, including the famous Koh-i-Noor diamond. His reign marked a significant period in Persian history, as he sought to restore the glory of the Safavid Empire. Despite his initial successes, Nadir Shah's rule became increasingly tyrannical, leading to widespread discontent. He was assassinated in 1747, which resulted in the fragmentation of his empire and a power struggle among various factions in Persia. His legacy remains controversial, as he is remembered both for his military prowess and his brutal governance.