A capable monarch and a patron of arts, Sigismund established Polish rule over Ducal Prussia and annexed the Duchy of Mazovia with Warsaw, whilst retaining the nation's wealth and prominence in the region. He assured that his nephew Albert, Duke of Prussia, and his Protestant successors will pay a feudal homage or tribute to Polish monarchs as a sign of political and diplomatic dependence. This was observed until the Treaty of Bromberg in 1657 when Prussia gained its sovereignty. Sigismund and commander Jan Amor Tarnowski also defeated Moldavia at Obertyn in 1531 and Muscovy in 1535, thereby strengthening the country's eastern borders. His 42-year reign was further marked by decisive contributions to Polish architecture, cuisine, language and customs, especially at the behest of his second wife, the Italian-born Bona Sforza. Italian styles and fashions dominated at the height of the Polish Renaissance and Polish Golden Age, which developed the Roman Catholic identity of Poland. He was commemorated on a contemporary 200-złoty banknote.