After India was invaded by the Mongol Khans and Turkic Muslims, the rulers of their major states on the subcontinent were titled "Sultān" or "Badshah" or "Shahanshah". In this manner, the only empress-regnant ever to have actually sat on the throne of Delhi was Razia Sultan. The Mughal Emperors were the only Indian rulers for whom the term was consistently used by Western contemporaries. The emperors of the Maratha Empire were called "Chhatrapati". From 1877 to 1947 the monarch of the United Kingdom adopted the additional title of Emperor/Empress of India ("Kaisar-i-Hind").