 The Ahmadiyya Muslim Community has a presence in eight districts of the country.Islam arrived in the region that comprises present-day Turkey, particularly the eastern provinces of the country, as early as the 7th century.The mainstream Hanafi school of Sunni Islam is largely organized by the state through the Presidency of Religious Affairs (known colloquially as "Diyanet"), which was established in 1924 following the abolition of the Ottoman Caliphate and controls all mosques and Muslim clerics, and is officially the highest religious authority in the country.