After the decisive Battle of Pavia, the Duchy of Milan became a possession of the Habsburgs of Spain: the new rulers did little to improve the economy of Lombardy, instead imposing a growing series of taxes needed to support their unending series of European wars. The eastern part of modern Lombardy, with cities like Bergamo and Brescia, was under the Republic of Venice, which had begun to extend its influence in the area from the 14th century onwards ("see also Italian Wars"). Between the middle of the 15th century and the battle of Marignano in 1515, the northern part of east Lombardy from Airolo to Chiasso (modern Ticino), and the Valtellina valley came under possession of the old Swiss Confederacy.