II. Marriage and issue In Altenburg on 25 October 1618 Johann Philipp married Elisabeth of Brunswick-Wolfenbüttel (dowager sister-in-law of his former regents, the Electors of Saxony Christian II and Johann Georg I). They had only one daughter: Elisabeth Sophie (b. Halle, 10 October 1619 - d. Gotha, 20 December 1680), married on 24 October 1636 to Ernest I, Duke of Saxe-Gotha. Ancestry References E. Pasch: Johann Philipp. In: Allgemeine Deutsche Biographie (ADB). Band 14, Duncker & Humblot, Leipzig 1881, S. 366–368. 1597 births 1639 deaths House of Wettin People from Torgau Dukes of Saxe-Altenburg