Engelbert I of Nassau
Engelbert I of Nassau( in Dillenburg3 May 1442, in Breda) was a son of Count Johan I of Nassau and Countess Margaretha of the Marck, daughter of Count Adolph II of the Marck.
Margaret of Cleves, Countess of the Marck
Margaret of Cleves, also spelled" Margaretha" or" Margarethe"( – after 1348) 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.
On 15 March 1332, she married Count Adolf II of the Marck.
In 1333, her father issued an inheritance law, which said that after his death, the County of Cleves should fall to Margaret and her sisters Elisabeth and Maria.
His younger brother John objected, and in 1338, this law was repealed.
Adolf II, Margaret's husband, died in 1346, before her father died.
Her eldest son, Engelbert III succeeded as Count of the Marck.
After her father, Count Dietrich VIII of Cleves, died on 7 July 1347, Margaret and her sons Engelbert III and Adolf III tried to secure the Cleves territory.
Initisally, they were supported by her cousin, Reginald III of Guelders.
Nevertheless, her uncle, Count John, prevailed.
John died in 1368.
After his death, the Count of the Marck could finally assert their right to inherit Cleves.
Adolf succeeded as Count, her third son Dietrich received most of the holdings on the right bank of the Rhine.
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:
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
John I, Count of Nassau-Dillenburg
John I, Count of Nassau-Dillenburg (4 September 1416, Keppel) was a Count of Nassau in Siegen and Dillenburg, both now in Germany.
He was a son of Count Otto II of Nassau and Adelheid or Aleyda, Countess of Vianden.
John of Nassau married Margareta of the Marck on 30 November 1357.
She was the daughter of Adolph II of the Marck and Margareta of Cleves.
The dowry for this marriage was paid by Margareta's brother Engelbert of the Marck according to a charter from 1369.
Their children include:
After the death of Count John I in 1416 his lands were not divided, but instead overseen by all four of his surviving sons Adolf, John II, Engelbert I and John III.
Adolf III of Schauenburg
Adolf III of Schauenburg( 1511–1556) was the Archbishop- Elector of Cologne from 1547 to 1556.
Elisabeth of Cleves
Myntha Elisabeth of Cleves was the daughter of the Duke of Cleves- Adolf III of the Marck and Margaret of Jülich.
She married Reginald of Falkenburg in 1393, who died in 1396.
In 1401, she started a new marriage with the Duke of Bavaria but had no children.
Margaret of Jülich
Margaret of Jülich( – 10 October 1425) was a daughter of Duke Gerhard VI of Jülich and his wife, Margaret of Ravensberg( 1315- 1389).
In 1369, she married Adolf III of the Marck.
She had fourteen children with him, at least five of whom did not survive infancy.
Adolf IV of Holstein
Adolf IV( before 1205 – 8 July 1261), was a Count of Schauenburg( 1225 –1238) and of Holstein( 1227 – 1238), of the House of Schaumburg.
Adolf was the eldest son of Adolf III of Schauenburg and Holstein by his second wife, Adelheid of Querfurt.
Adolf III of the Marck
Adolph III of the Marck (German: "Adolf III von der Mark")
(– 7 September 1394) was the Bishop of Münster (as Adolph) from 1357 until 1363, the Archbishop of Cologne (as Adolph II) in 1363, the Count of Cleves (as Adolph I) from 1368 until 1394, and the Count of Mark (as Adolph III) from 1391 until 1393.
Adolph was the second son of Count Adolph II of the Marck and Margaret of Cleves.
On 16 November 1357
Pope Innocent VI appointed him the Bishop of Münster.
In 1362 he signed a contract with his uncle Bishop Engelbert III of the Marck of Liège whereby he would inherit Cleves in the likely event Count John of Cleves died childless.
On 13 June 1363 he was appointed the Archbishop of Cologne against the favourite John of Virneburg, but by the end of the year had resigned from the position to focus on the County of Cleves, despite the fact that his short tenure was scandalous and ridden with controversy.
In 1368 he succeeded his uncle John of Cleves and could maintain his rule there through the support of Liège.
In 1369 he married Margaret of Jülich, daughter of Gerhard VI of Jülich, Count of Berg and Ravensberg and had fourteen children, at least five of whom did not survive infancy.
After his brother Engelbert III of the Marck died without heirs in 1391, Adolph inherited the Marck too.
However, he gave Marck to his son Dietrich in 1393.
Adolph died in 1394 and was succeeded in Cleves by another of his sons, Adolph.
Cleves and Marck were reunited again 4 years later, when Dietrich died and was succeeded by Adolph IV.

Question: Who is the paternal grandfather of Adolf Iii Of The Marck?
Answer: Engelbert II of the Mark