When Dietrich fell in battle in 1398, he was succeeded as Count of Mark by his elder brother Adolf. The ambitious Gerhard claimed a part of his father's territories for himself. In 1423, it came to an armed conflict between Adolf and Gerhard, who had allied himself with the Archbishop of Cologne.
Peace was signed between the two brothers in 1430, and confirmed in 1437. As a result, Gerhard ruled the largest part of Mark, but was to be succeeded by his nephew John.
Gerhard died in 1461 without children and the County of Mark and Duchy of Cleves were reunited again in a personal union under John I.
The County of Mark was a county and state of the Holy Roman Empire in the Lower Rhenish–Westphalian Circle. It lay on both sides of the Ruhr river along the Volme and Lenne rivers.
Dietrich or Theoderic of Oldenburg was a feudal lord in Northern Germany, holding the counties of Delmenhorst and Oldenburg. He was called "Fortunatus", as he was able to secure Delmenhorst for his branch of the Oldenburgs.
Helvig of Schauenburg (1398–1436) was a duchess of Schleswig and a countess of Holstein from the family of Schauenburg. She was the mother of King Christian I of Denmark and ancestor of the Danish Royal houses of Oldenburg and Schleswig-Holstein-Sonderburg-Glücksburg.
The Duchy of Jülich comprised a state within the Holy Roman Empire from the 11th to the 18th centuries. The duchy lay left of the Rhine river between the Electorate of Cologne in the east and the Duchy of Limburg in the west. It had territories on both sides of the river Rur, around its capital Jülich – the former Roman Iuliacum – in the lower Rhineland. The duchy amalgamated with the County of Berg beyond the Rhine in 1423, and from then on also became known as Jülich-Berg.
The Duchy of Cleves 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.
La Marck was a noble family, which from about 1200 appeared as the counts of Mark.
Adolph I of Cleves was the second Count of Cleves and the fourth Count of Mark.
John I, Duke of Cleves, Count of Mark was Duke of Cleves and Count of Mark.
Adolph III of the Marck was the Bishop of Münster from 1357 until 1363, the Archbishop of Cologne in 1363, the Count of Cleves from 1368 until 1394, and the Count of Mark from 1391 until 1393.
Dietrich VII (1256–1305) was Count of Cleves from 1275 through 1305. He was the son of Dietrich VI, Count of Cleves and his wife Aleidis von Heinsberg.
Dietrich VIII was a German nobleman. He was Count of Cleves from 1310 through 1347.
Johann was last Count of Cleves, from 1347 through 1368. Upon his death in 1368, the counties of Cleves and Count of Mark were united.
Gerhard V of Jülich, Count of Jülich (1297–1328), was the youngest son of William IV, Count of Jülich and Richardis of Guelders, daughter of Gerard III, Count of Guelders.
Adolf IX of Berg was the eldest son of Henry of Berg, Lord of Windeck and Agnes of the Mark.
Dietrich IX, Count of Mark (1374–1398) was the Count of Mark from 1393 until 1398.
Elizabeth of Nevers was Duchess of Cleves from 1455 until her death, due to her marriage with John I of Cleves-Mark. She was the matriarch of the house of Cleves-Nevers, and thus the Cleves line of the Counts and dukes of Nevers. Because the territory was part of her inheritance, it fell to her son Engelbert after her death.
Margaret of Jülich was a daughter of Duke Gerhard VI of Jülich and his wife, Margaret of Ravensberg (1315-1389).
Margaret of Cleves, also spelled Margaretha or Margarethe was the wife of Count Adolf II of the Marck and mother of Adolf III of the Marck. She was a daughter of Count Dietrich VIII of Cleves and Margaret of Guelders, who was a daughter of Reginald I of Guelders.
Gumprecht II of Neuenahr was a German nobleman. He inherited the County of Limburg via his wife.
Frederick III of Moers was a German nobleman. He was Count of Moers by inheritance and Count of Saarwerden by jure uxoris.
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