The Alawi dynasty, which rules the country to this day, seized power in 1631, and over the next two centuries expanded diplomatic and commercial relations with the Western world. It is among the world's oldest reigning royal dynasties. Morocco's strategic location near the mouth of the Mediterranean drew renewed European interest. In 1912, France and Spain established protectorates over the country and designated Tangier as an international zone, while the Sultan remained the formal sovereign with limited authority under colonial control. Following intermittent riots and revolts against colonial rule, Morocco regained its independence and reunified in 1956 under the leadership of Sultan Mohammed V.