Herzogtum Kleve
The duchy roughly comprised the territory of the present-day districts of Olpe and Hochsauerland, as well as the adjacent areas of the Soest district and Märkischer Kreis (Menden and Balve), from 1507 also the exclave of Volkmarsen (a former property of the Imperial Abbey of Corvey). The town of Soest was lost to the Duchy of Cleves-Mark after the Soest Feud in 1449.