Joachim Frederick (27 January 1546 – 18 July 1608), of the House of Hohenzollern, was Prince-elector of the Margraviate of Brandenburg from 1598 until his death in 1608.
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Biography
Joachim Frederick was born in Cölln to John George, Elector of Brandenburg, and Sophie of Legnica. He served as administrator of the Archbishopric of Magdeburg from 1566 to 1598, then succeeded his father as Elector of Brandenburg in 1598. Joachim Frederick was succeeded at his death by his son John Sigismund. Joachim Frederick's first marriage on 7 March 1570 was to Catherine of Brandenburg-Küstrin, daughter of John, Margrave of Brandenburg-Küstrin, and Catherine of Brunswick-Wolfenbüttel.
Joachim Frederick and Catherine of Brandenburg-Küstrin had children:
John Sigismund, Elector of Brandenburg (8 November 1572 – 23 December 1619)
Anne Catherine (26 June 1575 – 29 March 1612), married King Christian IV of Denmark
Girl [1576]
John George, Duke of Jägerndorf (16 December 1577 – 2 March 1624) married Eva Christina of Württemberg (1590 - 1657), daughter of Frederick I, Duke of Württemberg and Sibylla of Anhalt. Elected Bishop of Strasbourg 1592; resigned 1604. Herrenmeister (Grand Master) of the Order of Saint John from 1616 until his death.