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Why did Ala al-Din Khalji build the fortified city of Siri?

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Ala al-Din Khalji built the fortified city of Siri primarily as a defensive measure against Mongol plunderers who had been ravaging the suburbs of Delhi during the reign of the Khalji dynasty.

Designated as the new Khalji capital, Siri was a circular, fortified city located a short distance northeast of the Qutb Minar. It holds the historical distinction of being the first city in India to be built entirely anew by Muslim conquerors.1