House of La Tour d'Auvergne
Originally liensmen of the archbishops of Cologne in the Duchy of Westphalia, the family ruled the County of Mark, an immediate state of the Holy Roman Empire, and, at the height of their powers, the four duchies of Julich, Cleves, Berg and Guelders as well as the County of Ravensberg. Members of the family became bishops in the Prince-Bishoprics of Liège, Münster and Osnabrück, and Archbishops in Cologne. Later collateral lines became dukes of Bouillon, a title which was later inherited by the House of La Tour d'Auvergne, princes of Sedan, dukes of Nevers, counts of Rethel and so forth.