John George succeeded to the electorate on 23 June 1611 on the death of his elder brother, Christian II.The geographical position of the Electorate of Saxony rather than her high standing among the German Protestants gave her ruler much importance during the Thirty Years' War.
Christine of Saxe-Weissenfels, no issue Frederick I, Duke of Saxe-Gotha-Altenburg: 15 Jul 1646 2 Aug 1691 1. Magdalena Sibylla of Saxe-Weissenfels, had issue 2. Christine of Baden-Durlach, no issue Louise Elisabeth Kettler, Landgravine Consort of Hesse-Homburg: 23 Aug 1646 16 Dec 1690 Frederick II, Landgrave of Hesse-Homburg, had issue
379. Magdalene Sibylle of Saxe-Weissenfels (mother of 189) 380. John, Count of Leiningen-Dagsburg-Falkenburg (father of 190) 381. Countess Johanna Magdalene of Hanau-Lichtenberg (mother of 190) 382. George Louis, Count of Solms-Rödelheim and Assenheim (father of 191) 383. Countess Charlotte Sybille Ahlefeldt (mother of 191) 384.