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

Knowledge 1: 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. [SEP] Knowledge 2: 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.
Knowledge 1: 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. [SEP] Knowledge 2: 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.
Knowledge 1: 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. [SEP] Knowledge 2: 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.

Answer: Dietrich VI, Count of Cleves