Catholic League (German)

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This article is about the 17th-century German alliance. For other meanings, see Catholic League.

The Catholic League (1609-1635) was a confederation of Catholic German states formed in order to counteract the Protestant Union. Tension between these two groups would eventually ignite into the first phase of the Thirty Years' War.

The founder of this league, and its first commander, was Duke Maximilian I of Bavaria. In 1609 the rulers of many small states within the Holy Roman Empire gathered at Munich to sign the treaty, which effectively bound them into a military alliance with a nine-year term. Near the end of the league's term, war broke out between Ferdinand II, Holy Roman Emperor, and Frederick V, Elector Palatine. The Protestant Union naturally sided with Frederick against the Catholic League, which supported Ferdinand. The League managed to defeat the Protestants in the Battle of White Mountain 1620 during the first phase of the war. It was formally dissolved in the 1635 Peace of Prague.