Frederick I, Holy Roman Emperor
Clementia was firstly married in 1147 to Henry the Lion, Duke of Saxony, he later inherited Bavaria. The marriage was arranged to confirm her father's alliance with the Welf party in Southern Germany. She was heiress of Badenweiler, although her husband sold these Swabian estates to Frederick I, Holy Roman Emperor in 1158, receiving in exchange Herzberg, Scharzfels and Pöhlde south of the Harz.