The region of Île-of-France finds its origins in the formed real property from century X by the Dynasty of the Capetos. Their limits have changed from the aim of the Old Regime. This province I extended more to the west and mainly towards the north, she was less vast than at the present time in direction of the east and the south. It formed the zone of economic interest of the commercial corporations of Paris, which contribuyenron to fix its borders.
After the French Revolution, it was divided in three departments: Seine(Sena), Seine-ET-Oise(Sena and Oise) and Seine-ET-Marne(Sena and Marne). In 1965, the number of departments happened from three to eight, including Paris. One of them, the one of Seine-ET-Marne, almost occupies half of the regional surface. Around Paris, Hauts-of-Seine(Altos of the Seine), Seine-Saint-Denis (Sena-San Denís) and him Val-of-Marne(Valle of the Marne) they form the call petite couronne (small crown). The departments of Val-d'Oise(Valle of the Oise), Yvelines and Essonne constitute great couronne (great crown). The region was reconstituída in 1945 and a work of administrative decentralización as of 1964 was made; the political decentralization of 1982 consolidated the old provinces.