and
Lenne in
Altena Originally belonging to a collateral line of the counts of
Berg at Altena, the territory emerged under the name of
Berg-Altena in 1160. About 1198 Count
Frederick I purchased the
Mark Oberhof, a
parish land (
Feldmark) on the territory of the Edelherren of Rüdenberg, liensmen of the
Cologne archbishop
Philip von Heinsberg. Here Frederick had the Mark Castle (
Burg Mark) erected as the residence of the new "Counts of the Mark". The nearby town of
Hamm was founded by his son
Adolf I, Count of the Mark in 1226, it soon became most important settlement of the county and was often used as residence. In the 1288
Battle of Worringen, Count
Eberhard II fought on the side of Duke
John I of Brabant and Count Adolph V of Berg against his liege, the Cologne archbishop
Siegfried II of Westerburg, titular Duke of
Westphalia. As Brabant and its allies were victorious, the County of Mark gained supremacy in southern Westphalia and became independent of the
Archbishopric of Cologne. The territory of Mark was for long restricted to the lands between the Ruhr and Lippe rivers ("Lower Mark"). New territories in the north ("Higher Mark") were gained during the 14th century in wars against the
Prince-Bishopric of Münster. In 1332, Count
Adolph II married Margarete, the daughter of Count
Dietrich VIII of Cleves. Adolph's younger son
Adolph III upon the death of Dietrich's brother Count
John acquired the
County of Cleves on the western banks of the
Rhine in 1368. In 1391, Adolph III also inherited the Mark from his elder brother
Engelbert III and united both counties as "Cleves-Mark" in 1394. In 1509, the heir to the throne of Cleves-Mark
John III the Peaceful married
Maria, the daughter of Duke William IV of Berg and
Jülich. In 1511, he succeeded his father-in-law in Jülich-Berg and in 1521 his father in Cleves-Mark, resulting in the rule of almost all territories in present
North Rhine-Westphalia in
personal union, except for the ecclesiastical states. The dynasty of Jülich-Cleves-Berg became extinct in 1609, when the insane last duke
John William had died. A long dispute about the succession followed, before the territory of Mark together with Cleves and
Ravensberg was granted to the
Brandenburg Elector
John Sigismund of Hohenzollern by the 1614
Treaty of Xanten (generally accepted in 1666). It then became part of the
Kingdom of Prussia after 1701. In 1807, the County of the Mark passed from Prussia to
France in the
Treaties of Tilsit. In 1808,
Napoleon then gave Mark to the elevated
Grand Duchy of Berg, which was divided into four
departments along the lines of Napoleonic France. Mark was in the Ruhr Department until the collapse of French power in 1813, when it returned to Prussia. The Prussian administrative reform of 30 April 1815 placed Mark within Regierungsbezirk Arnsberg,
Province of Westphalia. The Hohenzollern Prussian sovereigns remained Counts of the "Prussian County of the Mark" until 1918. The "County of the Mark" has no official meaning anymore, but is used to informally refer to the region in
North Rhine-Westphalia. == List of counts ==