William of Brandenburg
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William of Brandenburg (German: Wilhelm von Brandenburg; 1498 - 1563) was the Archbishop of Riga from 1539-1561.
A member of the House of Hohenzollern, William was the son of Frederick I, Margrave of Brandenburg-Ansbach, the brother of Albert, Duke of Prussia, and the grandson of Albert III Achilles, Elector of Brandenburg.
After William's administration as Prince-bishop ended during the Livonian War, Riga became an Imperial Free City (1561-1581).