John Sigismund, Elector of Brandenburg

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John Sigismund
Portrait (unknown artist, c. 1610)
Elector of Brandenburg
Reign	18 July 1608 – 23 December 1619
Predecessor	Joachim Frederick
Successor	George William
Duke of Prussia
Reign	28 August 1618 – 23 December 1619
Predecessor	Albert Frederick
Successor	George William
Born	(1572-11-08)8 November 1572 Halle, Archbishopric of Magdeburg, Holy Roman Empire
Died	23 December 1619(1619-12-23) (aged 47) Berlin, Electorate of Brandenburg, Holy Roman Empire
Burial	Berlin Cathedral
Spouse	Anna of Prussia ​ (m. 1594)​
Issue more...	George William, Elector of Brandenburg Anne Sophia, Duchess of Brunswick-Lüneburg Maria Eleonora, Queen of Sweden Catherine, Princess of Transylvania Joachim Sigismund of Brandenburg
House	Hohenzollern
Father	Joachim Frederick, Elector of Brandenburg
Mother	Catherine of Brandenburg-Küstrin
Religion	Lutheran (until 1613) Calvinist (since 1613)
Signature

John Sigismund (German: Johann Sigismund; 8 November 1572 – 23 December 1619) was a Prince-elector of the Margraviate of Brandenburg from the House of Hohenzollern. He became the Duke of Prussia through his marriage to Duchess Anna, the eldest daughter of Duke Albert Frederick of Prussia who died without sons. Their marriage resulted in the potential creation of Brandenburg-Prussia, which became a reality after Poland's leader appointed John Sigismund in charge of Prussia in regency and, shortly thereafter, Albert Frederick died without an able, direct male heir.