The Khanate of Kalat (Urdu and Balochi: خانیت قلات) was a princely state that existed from 1666 to 1955 in the centre of the modern-day province of Balochistan, Pakistan. Prior to that they were subjects of Mughal emperor Akbar. Ahmedzai Baloch ruled the state independently until 1839, when it became a self-governing state in a subsidiary alliance with British India. After the signature of the Treaty of Mastung by the Khan of Kalat and the Baloch Sardars in 1876, Kalat became part of the Baluchistan Agency. It was briefly independent from August 1947 till March 1948, when its khan acceded his state to the new Dominion of Pakistan. It remained a princely state of Pakistan until 1955, when it was incorporated into the country.