Frederick III was married twice. Firstly, he married in 1537 Marie of Brandenburg-Kulmbach (1519 – 1567), daughter of Casimir, Margrave of Brandenburg-Bayreuth and Susanna of Bavaria. Their children were: Alberta (4 April 1538 – 19 March 1553) Louis VI, Elector Palatine (4 July 1539 – 22 October 1583)
In a brief ceremony in the field camp after the battle on 4 June 1547 Duke Maurice of Saxony was raised to the dignified position of Elector of Saxony. The official appointment took place later, but at a high price: He had betrayed the Protestant Faith and had brought his father-in-law, Philip of Hesse, into a hopeless situation.