Page "Joachim III Frederick, Elector of Brandenburg" Paragraph 1

Joachim III 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 8 January 1570 was to Catherine of Brandenburg-Küstrin, daughter of John, Margrave of Brandenburg-Küstrin, and Catherine of Brunswick-Wolfenbüttel.

Joachim Frederick's second marriage, on 23 October 1603, was to Eleanor of Prussia, born 12 August 1583, daughter of Albert Frederick and Marie Eleonore of Cleves.

He became regent of the Duchy of Prussia in 1605.