sentences:  When the branch of Gemen became extinct in 1800, the branch of Styrum failed to inherit their possessions, and Gemen passed to the barons von Boyneburg-Bömelberg.In 1806 the Confederation of the Rhine occurred and Gemen was mediatised to the Principality of Salm-Kyrburg.At the same moment Styrum was mediatised to the Grand Duchy of Berg.