Nadir Shah, the Persian ruler, invaded the Mughal Empire in India in 1739. He defeated the Mughal army (Mughal Ruler: Muhammad Shah) at the Battle of Karnal on February 24, 1739. He then entered Delhi and looted the city on March 20, 1739. The invasion of Nadir Shah brought him immense wealth, including the Peacock Throne and the Koh-i-Noor diamond.