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Hapsburg Rule
and increasing Germanization loosened Silesia's historic ties with Poland. However, the ducal title, along with several fiefs, remained with the Silesian branch of the Piast dynasty until the extinction of the line in 1675. The margraviate of JAgerndorf was purchased in 1523 by a cadet branch of the Hohenzollern dynasty of Brandenburg, which later also claimed inheritance to other Silesian fiefs. Elector Joachim II of Brandenburg, moreover, concluded (1537) an alliance with the Piast duke, by which Brandenburg would inherit the Piast principalities if the Piast dynasty became extinct. This treaty was declared invalid by King Ferdinand I of Bohemia (later Emperor Ferdinand I). In 1621, John George of JAgerndorf, brother of the elector of Brandenburg, lost his fief for having supported Frederick the Winter King.
The Thirty Years War (1618–48) brought untold misery to Silesia under successive Saxon, imperial, and Swedish occupation. It reverted to Austrian control at the Peace of Westphalia (1648). In 1675, on the death of the last Piast, Austria incorporated the Piast territories into the Bohemian crown domain. The Counter Reformation had by then made great progress in Silesia, although Lutheranism was tolerated in Breslau (Wroclaw) and certain other districts.
It was on the very shaky dynastic grounds indicated above that Frederick II of Prussia, as heir of the house of Brandenburg, claimed a portion of Silesia in 1740 from Maria Theresa, who had just assumed the succession to Austria, Bohemia, and Hungary. His claim and his offer to assist Maria Theresa in the impending War of the Austrian Succession were rejected by the queen while Prussian troops were already invading Silesia. The Silesian Wars (1740–42 and 1744–45) were part of the general War of the Austrian Succession. By the Treaty of Berlin (1742), Maria Theresa ceded all of Silesia except Teschen and present Czech Silesia to Prussia; this cession was ratified by the Treaty of Dresden (1745). In the Seven Years War, Prussia retained Silesia.
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