United Duchies of Jülich-Cleves-Berg
In 1511 Duke John III of Cleves inherited Jülich and Berg through marriage with Maria of Jülich-Berg, the daughter of the last Duke, William IV. She inherited her father's estates: Jülich and Berg with the County of Ravensberg. From 1521 Jülich-Berg and Cleves formed the United Duchies of Jülich-Cleves-Berg in a personal union under Duke John III.