This fort was originally built by Kempe Gowda of the Vijaynagar Empire as a mud fort. Later, it was converted into a stone fort by Haider Ali and then it became a stronghold of Tipu Sultan. Identify this fort.

Bangalore Fort is the correct answer as it was originally built as a mud fort in 1537 by Kempe Gowda I, the founder of Bangalore. It was later strengthened and converted into a stone fort by Haider Ali in the 18th century and became an important stronghold for Tipu Sultan. Belgaum Fort was built by the Ratta dynasty, while Devanahalli Fort is where Tipu Sultan was born, not built by Kempe Gowda.