Answer: Shershah
Notes: Purana Qila, Delhi's oldest fort, was built by Sher Shah Suri and completed by Islam Shah. It is located at the site of ancient Indraprastha. The Qila-i-Kuhna Mosque features pre-Mughal architecture. Excavations have uncovered artifacts from various historical periods, indicating continuous habitation. The fort includes Sher Mandal, a library used by Humayun, who died there.
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