John Sigismund, Elector of Brandenburg
Prince-elector of the Margraviate of Brandenburg
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Updated 2026-06-09
He married into Prussia and ended up running it — a dynastic move that set the stage for Brandenburg-Prussia, the entity that would eventually become the kingdom that unified Germany.
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John Sigismund was born on 8 November 1572 into the House of Hohenzollern, already Prince-elector of Brandenburg. His marriage to Anna, eldest daughter of Duke Albert Frederick of Prussia, positioned him for something larger: Albert Frederick had no sons. When Poland's leader appointed John Sigismund to govern Prussia as regent, the merger of the two territories came within reach. Albert Frederick died without a capable direct male heir, and the union became real — Brandenburg-Prussia, a composite state that would reshape northern Europe. John Sigismund died on 23 December 1619, having locked…
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