The Ottoman dynasty or "House of Osman" ( 1280–1922) was unprecedented and unequaled in the Islamic world for its size and duration. The Ottoman sultan, pâdişâh or "lord of kings", served as the empire's sole regent and was considered to be the embodiment of its government, though he did not always exercise complete control. The Ottoman family was originally Turkish in its ethnicity, as were its subjects; however the kingship quickly acquired many different ethnicities through intermarriage with slaves and European nobility.