Austrian Habsburgs and Polish Vasas rule With the death of King Ludvík II of Bohemia at the Battle of Mohács, Silesia was inherited by Ferdinand I, placing Opole under the sovereignty of the Habsburg monarchy of Austria. The Habsburgs took control of the region in 1532 after the last Piast duke of Opole, Jan II the Good, died. At that time the city was still mainly Polish-speaking (around 63%), with other nationalities represented mainly by Germans, Czechs and Jews. The last two dukes of Opole, Nicholas II and Janusz II the Good, did not master the German language. Beginning in 1532 the Habsburgs pawned the duchy to different rulers including several monarchs of Poland (see Dukes of Opole). After the Swedish invasion of Poland, in 1655 the King of Poland, John II Casimir Vasa, stayed with his entire court in Opole. In Opole in November 1655, the Universal of Opole (Uniwersał opolski) was issued by the King, calling for Poles to rise against the Swedes, who at that time occupied a large part of Poland. With the abdication of King John II Casimir of Poland as the last Duke of Opole in 1668, the region passed to the direct control of the Habsburgs. At the beginning of the 18th century the German population of Opole was estimated at around 20%. In Prussian Silesia King Frederick II of Prussia conquered most of Silesia from Austria in 1740 during the Silesian Wars; Prussian control was confirmed in the Peace of Breslau in 1742. In the 18th century, Opole belonged to the tax inspection region of Prudnik. Under Prussian rule the ethnic structure of the city began to change. In the early 20th century the number of Polish and bilingual citizens of Opole, according to the official German statistics, varied between 25% and 31%. Nonetheless, Opole remained an important cultural, social and political center for the Poles of Upper Silesia. From 1849 the Polish newspaper Gazeta Wiejska dla Górnego Śląska was published in Opole. Polish reporter and opponent of Germanisation Bronisław Koraszewski founded the newspaper Gazeta Opolska in 1890 and the People's Bank in Opole (Opolski Bank Ludowy) in 1897. Another Polish newspaper, the Nowiny was founded by Franciszek Kurpierz in 1911. From 1816–1945 Opole was the capital of Regierungsbezirk Oppeln within Prussia. The city became part of the German Empire during the unification of Germany in 1871. After World War I After