context: Bhubanagiri is a town in the Nalgonda district in the state of Telengana. Bhuvanagiri is an important map. The fort at Bhuvanagiri was very famous during the Kakatiyas. The fort was built on a monolithic hillock by the ruler of the Western Chalukya dynasty, the trianguana Malla Vikramaditya (sixth). It is named after him. The name was gradually changed to Bhuvanagiri. This is a story.
question: Who built the Bhuvanagiri Fort?
answers.text: trianguana Malla Vikramaditya