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Zain-ud-Din Khan known as Zain Khan Sirhindi (died 1764) was the Mughal Faujdar of Sirhind, he was a serviceman of Shah Alam II, an ally of Najib-ud-Daula and Ahmad Shah Durrani. Zain Khan Sirhindi fought during the Third Battle of Panipat and strengthened Mughal rule in the region. Zain Khan was sipahsalar and a great noble at the court of Ahmed Shah Durrani. After the conquest of Delhi by that monarch, he held the subahdarship of Sirhind.