House of Welf Celle Castle German States to 1918 F-M The Welfs Further reading Wilhelm Havemann: Geschichte der Lande Braunschweig und Lüneburg. 3 Bände. Nachdruck. Hirschheydt, Hannover 1974/75, (Originalausgabe: Verlag der Dietrich'schen Buchhandlung, Göttingen 1853-1857) (in German) Principalities of the Holy Roman Empire Duchy of Brunswick-Lüneburg States and territories established in 1267 Principality 1260s establishments in the Holy Roman Empire 1269 establishments in Europe 1705 disestablishments in the Holy Roman Empire Former states and territories of Lower Saxony Former principalities