Wilhelm (6 July 1785 – 2 July 1823) Due to mental illness, Wilhelm was duke in name only, with his cousin Peter, Prince-Bishop of Lübeck, acting as regent throughout his entire reign.[6]
^Apfelstedt, F.; Apfelstedt, Heinrich Friedrich Theodor (1996). Das Haus Kevernburg-Schwarzburg von seinem Ursprunge bis auf unsere Zeit. Thüringer Chronik-Verlag Müllerott. ISBN978-3-910132-29-0.
^J. Morley, "The Bauhaus Effect," in Social Utopias of the Twenties (Germany: Müller Bushmann press, 1995), 11.
^Klemme, Heiner F. (2006), "Heydenreich, Karl Heinrich", in Haakonssen, Knud (ed.), The Cambridge History of Eighteenth-Century Philosophy, vol. 2, Cambridge University Press, pp. 1180–81