The Duchy of Cleves (German: Herzogtum Kleve; Dutch: Hertogdom Kleef) was a state of the Holy Roman Empire which emerged from the medieval Hettergau. It was situated in the northern Rhineland on both sides of the Lower Rhine, around its capital Cleves and the towns of Wesel, Kalkar, Xanten, Emmerich, Rees and Duisburg bordering the lands of the Prince-Bishopric of Münster in the east and the Duchy of Brabant in the west. Its history is closely related to that of its southern neighbours: the Duchies of Jülich and Berg, as well as Guelders and the Westphalian county of Mark. The Duchy was archaically known as Cleveland in English.
The duchy's territory roughly covered the present-day German districts of Cleves (northern part), Wesel and the city of Duisburg, as well as adjacent parts of the Limburg, North Brabant and Gelderland provinces in the Netherlands.
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History
In the early 11th century Emperor Henry II entrusted the administration of the Klever Reichswald, a large forested area around the Kaiserpfalz at Nijmegen directly subordinate to the Imperial rule, to local Lower Lorrainian nobles at Geldern and Kleve. A County of Cleves (German: Grafschaft Kleve; Dutch: Graafschap Kleef) was first mentioned in the 11th century. Dietrich I was the first Count of Cleves and reigned from 1092 through 1119. In 1283, Cleves fought in the War of the Limburg Succession and helped weaken the powerful Electorate of Cologne. In 1355 Zevenaar passed from the control of the Duchy of Guelders to the County of Cleves.