sentences:  The house of Saxe-Weimar and the first house of Saxe-Altenburg, which later separated from Saxe-Weimar (see also the Ernestine duchies), both descend from Johann Wilhelm.In Heidelberg on 15 June 1560 Johann Wilhelm married Dorothea Susanne of Simmern, daughter of Frederick III, Elector Palatine.They had five children