Milan is the second-most populous city in Italy, the first considering the metro area, and the capital of the Lombardy Region. Milan was founded by the Insubres, a Celtic people. The city was later conquered by the Romans, becoming the capital of the Western Roman Empire. During the Middle Ages, Milan flourished as a commercial and banking center. In the course of centuries, it has been alternatively dominated by France, Habsburg Spain, and Austria, until when in 1859 the city was eventually annexed by the new Kingdom of Italy.