Frederick III, Holy Roman Emperor
During the reign of Louis I, who conducted four unsuccessful feuds against his cousin Frederick I, Elector Palatine, the districts of Lambsheim, Wachenheim and Waldböckelheim were lost to the Electoral Palatinate. Frederick III, Holy Roman Emperor, who was also in conflict with the Electoral Palatinate, appointed Louis I as his field marshal and recognized Palatine Zweibrücken as a duchy. Louis I stimulated mining and simplified the administration of the duchy.