Nizam Shah I was the first sultan of which dynasty and built Ahmednagar Fort to defend the city agai...........

Explanation:

The fort was built by Malik Ahmad Nizam Shah I (after whom the city of Ahmednagar is named) in 1427. He was the first sultan of the Nizam Shahi dynasty and he built the fort to defend the city against invaders from neighbouring Idar Initially it was made of mud but major fortification began in 1559 under Hussain Nizam Shah. It took four years and was finally finished in 1562.