Question: Who is the maternal grandfather of Margaret Of Jülich?

Knowledge 1: 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. [SEP] Knowledge 2: Margaret of Ravensberg
Margaret of Ravensberg (– 13 February 1389) was the daughter and heiress of Otto IV, Count of Ravensberg and Margaret of Berg-Windeck.Margaret's father, Otto, had no sons, so at his death in 1328, the County of Ravensberg went to his younger brother Bernhard.However, when Bernhard died in 1346 without issue, Margaret became the heiress of Ravensberg, her elder sister and only sibling, Hedwig, having died in 1336.Then, when Margaret's uncle, Adolf IX of Berg, died in 1348 without issue, Margaret also inherited Berg by right of her mother, since Margaret was Adolf's only surviving niece.As a result of her marriage to Gerhard VI of Jülich, Berg and Ravensberg passed into the house of Jülich where they remained until 1511 when they passed into the house of Cleves.
Knowledge 1: 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. [SEP] Knowledge 2: Adolf, Duke of Jülich-Berg
Adolf, Duke of Jülich- Berg( c. 1370 – 14 July 1437), was the first Duke of the combined duchies of Jülich and Berg.He was the son of William VII of Jülich, 1st Duke of Berg and Anna of the Palatinate.In 1397, Adolf rebelled against his father along with his brother William, ravaged Düsseldorf and imprisoned his father.He was outlawed and was subsequently subdued in 1405.Upon his father's death in 1408, Adolf became the 2nd Duke of Berg.Adolf fought against Lorraine and other pretenders for Bar but surrendered after his capture in 1417.His father's cousin, Reginald, Duke of Jülich and Guelders, had no heirs and upon his death in 1423, Adolf succeeded him in three- fourths of the Duchy, the fourth quarter( called" Jülicher Quart") was inherited by John II of Loon, Lord of Heinsberg and Löwenberg, grandson of the first duke of Jülich, William V.The dukedom of Jülich passed to Adolf, thus becoming the first duke of the combined duchies of Jülich and Berg. John II. of Loon- Heinsberg was than also called Lord of Jülich.Adolf also began a year- long hereditary war against the House of Egmond for the dukedom of Guelders but could not win even with financial support from Sigismund, Holy Roman Emperor, who supported Adolf in this fight despite Adolf's opposition to Sigismund's coronation at Aachen in 1414.Adolf supported the Roman candidate in the Council of Constance which ended the Western Schism.He traditionally fought against the Archbishop of Cologne.He later secured Monschau- Montjoie and in 1428 he seized Lievandal- Wevelinghoven.Adolf had only one son who died before him so after Adolf's death in 1437, the dukedom of Jülich- Berg passed to his nephew Gerhard, son of his brother William.Adolf died in Cologne on 14 July 1437 and is buried at Great St. Martin Church, Cologne.
Knowledge 1: 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. [SEP] Knowledge 2: William V, Duke of Jülich
William V, Duke of Jülich( – 25/26 February 1361) was a German nobleman.Some authors call him William I, because he was the first" Duke of Jülich"; the earlier Williams had been" Count of Jülich".Other authors call the subject of this article" William VI"; they count the son and co-ruler of William IV as William V. William V was the eldest son of Gerhard V of Jülich and Elisabeth of Brabant- Aarschot, daughter of Godfrey of Brabant.William V was a key political figure of his time, being a brother- in- law to both Edward III of England and Emperor Ludwig IV.He spent enormous sums of money to have his brother Walram of Jülich appointed as Archbishop of Cologne over Adolph II of the Marck.In 1337 he was crucially involved in the German- English alliance which caused the start of the Hundred Years' War. William was an important supporter of Emperor Ludwig and for a time, he supported the Habsburgs against the House of Luxembourg in the Carinthian war of succession.Upon the collapse of the German- English alliance and the death of his brother- in- law, William switched his allegiance to Emperor Charles IV.In 1352 he initiated an inheritance tax on Heinsberg- Valkenburg/ Monschau.William won important positions through his Archbishop brother and also served for a time as a field captain for Flanders in the Hundred Years' War.His sons fought against him during an uprising of part of the Jülich knighthood which opposed inclusion in the increasing territorial state, and he was imprisoned by them in 1349, but released in 1351 due to public pressure.Upon his father's death in 1328, William became Count of Jülich.In 1336 William was appointed Margrave by his brother- in- law, Emperor Ludwig IV, and in 1356/ 57 he was raised to the level of Duke by Emperor Charles IV, thus becoming the first Duke of Jülich.His skillful marriage policy, especially the marriage of his son Gerhard to Margaret of Ravensberg, heiress of Berg and Ravensberg, enabled him to add territory to the house of Jülich.Upon William's death in 1361, the Duchy of Jülich passed to his second son, William, his eldest son having predeceased.William and his wife are buried in Nideggen.He seems to have held the title of Earl of Cambridge from 1340 to his death.

Answer: Otto IV, Count of Ravensberg