Johann, Count of Cleves
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.
Johann was the youngest son of Dietrich VII, Count of Cleves and his second wife Margaret of Habsburg.
He succeeded in 1347 his brother Dietrich VIII, Count of Cleves who had died without sons.
He married Mechteld of Guelders( † 1384), daughter of Reginald II, Duke of Guelders, but the marriage remained childless.
After his death, the County of Cleves went to Adolf III of the Marck and so to the Counts of Marck.
Dietrich VII, Count of Cleves
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.
The County of Cleves was a comital polity of the Holy Roman Empire in present Germany( part of North Rhine- Westphalia) and the Netherlands( parts of Limburg, Noord- Brabant and Gelderland).
Its rulers, called counts, had a special and privileged standing in the Empire.
The County of Cleves was first mentioned in the 11th century.
In 1417, the county became a duchy and its rulers were raised to the status of Dukes.
Its history is closely related to that of its neighbours: the Duchies of Jülich, Berg and Guelders and the County of Mark.
In 1368, Cleves and Mark were united.
In 1521 Jülich, Berg, Cleves and Mark formed the United Duchies of Jülich- Cleves- Berg.
The territory was situated on both sides of the river Rhine, around its capital Cleves and roughly covering today's districts of Cleves, Wesel and the city of Duisburg.
Dietrich VIII, Count of Cleves
Dietrich VIII( – 7 July 1347) was a German nobleman.
He was Count of Cleves from 1310 through 1347.
Dietrich was the son of Dietrich VII, Count of Cleves and his second wife Margaret of Habsburg.
He succeeded in 1310 his half- brother Otto, Count of Cleves who had died without sons.
Dietrich VIII married twice:
He was succeeded by his brother John.< br>
When his brother also died without a son, the County of Cleves went to his daughter's son Adolph III of the Marck and so to the Counts of Marck.
Dietrich V, Count of Cleves
Dietrich V was Count of Cleves from 1201 through 1260.
Dietrich was born about 1185 as the son of Dietrich IV, Count of Cleves and Margaret of Holland.
Possibly Dietrich V succeeded in 1198, under regency of Arnold II.
In 1234, he participated in the Stedinger Crusade.
Adolf III of Berg
Adolf III of Berg( 1080 – 12 October 1152) was count of Berg from 1093 until 1132, and count of Hövel from 1090 until 1106, and Vogt of Werden.
He was the son of Adolf II of Berg- Hövel, count of Berg, and Adelaide of Lauffen.
He married Adelheid of Cleves( von Kleve), a daughter of Dietrich II count of Cleves( died 1118).
They had issue:
Adolph I, Duke of Cleves
Adolph I of Cleves( 2 August 1373 – 23 September 1448) was the second Count of Cleves and the fourth Count of Mark.
Otto, Count of Cleves
Otto( 1278 – Horstmar, October 29, 1310) was Count of Cleves from 1305 through 1310.
Otto was the eldest son of Dietrich VII, Count of Cleves( 1256 – 1305) and his first wife Margaret of Guelders .<br>
His first marriage was to Adelheid van der Marck, daughter of Engelbert I, Count of the Mark and secondly to Mechteld von Virneburg, a niece of Heinrich II of Virneburg .< br>
They had one daughter Irmgard of Cleves, who married Adolph II of the Marck and later John IV of Arkel.
When he died in 1310 he was succeeded by his half- brother Dietrich VIII.
Dietrich VI, Count of Cleves
Dietrich VI (also known as Dietrich of Meissen), was Count of Cleves from 1260 through 1275.
He was born in 1226 as the son of Dietrich V, Count of Cleves and Hedwig of Meissen.
The County of Cleves  was a comital polity of the Holy Roman Empire in present Germany (part of North Rhine-Westphalia) and the Netherlands (parts of Limburg, Noord-Brabant and Gelderland).
Its rulers, called counts, had a special and privileged standing in the Empire.
The County of Cleves was first mentioned in the 11th century.
In 1417, the county became a duchy  and its rulers were raised to the status of Dukes.
Its history is closely related to that of its neighbours: the Duchies of Jülich, Berg and Guelders and the County of Mark.
In 1368, Cleves and Mark were united.
In 1521 Jülich, Berg, Cleves and Mark formed the United Duchies of Jülich-Cleves-Berg.
The territory was situated on both sides of the river Rhine, around its capital Cleves and roughly covering today's districts of Cleves, Wesel and the city of Duisburg.
John I, Duke of Cleves
John I, Duke of Cleves, Count of Mark( 16 February 1419 – 5 September 1481) was Duke of Cleves and Count of Mark.
Adolph II of the Marck
Adolph II of the Marck( died 19/20 October 1347, Fröndenberg) was Count of the Marck.
He was the eldest son of Engelbert II of the Mark and Mechtild of Arenberg.
Adolph was betrothed to Irmgard of Cleves, daughter of Otto, Count of Cleves and his( second) wife Mechtild of Virneburg.
After obtaining a papal dispensation Adolf was allowed to marry Margaret of Cleves, the daughter of Dietrich VIII, Count of Cleves and Margaret of Guelders.
Adolph and Margaret of Cleves had seven children:

Question: Who is the paternal grandfather of Dietrich Vi, Count Of Cleves?