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Frederick William (born Feb. 16, 1620, Cölln, near Berlin—died May 9, 1688, Potsdam, near Berlin) was the elector of Brandenburg (1640–88), who restored the Hohenzollern dominions after the devastations of the Thirty Years’ War—centralizing the political administration, reorganizing the state finances, rebuilding towns and cities, developing a strong army, and acquiring clear sovereignty over ducal Prussia. All these measures contributed to the foundation of the future Prussian monarchy. Frederick William was the eldest son of...