Bangalore Fort began in 1537 as a mud fort. The builder was Kempe Gowda I, a vassal of the Vijaynagar Empire and the founder of Bangalore, now Bengaluru. Haider Ali in 1761 replaced the mud fort with a stone fort. The army of the British East India Company, led by Lord Cornwallis on 21 March 1791 captured the fort in the siege of Bangalore during the Third Mysore War (1790–1792). At the time the fort was a stronghold for Tipu Sultan. Today, the fort's Delhi gate, on Krishnarajendra Road, and two bastions are the primary remains of the fort. A marble plaque commemorates the spot where the British breached fort's wall, leading to its capture. The old fort area also includes Tipu Sultan's Summer Palace, and his armoury. The fort has provided the setting for the treasure hunt in the book Riddl