The fort at Allahabad was surrendered to the forces of Mughal emperor Aurangzeb.
Allahabad Fort
Allahabad Fort was built by the Mughal emperor Akbar at Allahabad in 1583. The fort stands on the banks of the Yamuna, near its confluence with the Ganges. It is classified by the Archaeological Survey of India as a monument of national importance.
Prayagraj
Prayagraj, formerly and colloquially known as Allahabad, is a metropolis in the Indian state of Uttar Pradesh. It is the administrative headquarters of the Prayagraj district, the most populous district in the state and 13th most populous district in India and the Prayagraj division. The city is the judicial capital of Uttar Pradesh with the Allahabad High Court being the highest judicial body in the state. As of 2011, Prayagraj is the seventh most populous city in the state, thirteenth in Northern India and thirty-sixth in India, with an estimated population of 1.53 million in the city. In 2011, it was ranked the world's 40th fastest-growing city. The city, in 2016, was also ranked the third most liveable urban agglomeration in the state and sixteenth in the country. Hindi is the most widely spoken language in the city.
Mughal Empire
The Mughal Empire was an early modern empire in South Asia. At its peak, the empire stretched from the outer fringes of the Indus River Basin in the west, northern Afghanistan in the northwest, and Kashmir in the north, to the highlands of present-day Assam and Bangladesh in the east, and the uplands of the Deccan Plateau in South India.
Aurangzeb
Alamgir I, commonly known by the title Aurangzeb, was the sixth Mughal emperor, reigning from 1658 until his death in 1707. Under his reign, the Mughal Empire reached its greatest extent, with territory spanning nearly the entirety of the Indian subcontinent.