Delhi is the National Capital Territory of India and it contains its capital, New Delhi. With a population of 28 million, it is the largest metropol in India, and second only to Tokyo in Asia. Delhi traces its origins to the city of Indraprashta, the capital of the Pandvas of the epic Mahabharata. It gained prominent importance as the centre of the Delhi Sultanate in the 13th to 16 centuries. Due to tensions in Bengal in 1911, the British moved their capital from Calcutta to a planned location next to Delhi and called it New-Delhi. Delhi is the largest commercial centre of North India. Its key service industries are information technology, telecommunications, hotels, banking, media and tourism