William II, Duke of Jülich
William II, Duke of Jülich( – 13 December 1393) was the second Duke of Jülich and the sixth William in the House of Jülich.
He was the second son of William I of Jülich and Joanna of Hainaut.
William was co-ruler from 1343.
He quarreled greatly with his father and imprisoned him from 1349- 1351.
He tried for many years in Holland- Zeeland to enforce claims against the House of Wittelsbach but failed.
When his father died in 1361, William became the second Duke of Jülich, his elder brother Gerhard having predeceased their father.
He led the traditional feuds of the House of Jülich and lost Kaiserswerth and Zülpich, among others.
William intervened in favor of Edward in the catastrophic war of succession between his brothers- in- law Reinald and Edward for control of the Duchy of Guelders.
He took part in the 1371 Battle of Baesweiler( in which Edward was mortally wounded) and captured Wenceslaus I, Duke of Luxembourg.
His brother- in- law Reinald died later in 1371 and as neither Reinald nor Edward left heirs, another fight for the succession of Guelders arose between William and his wife Maria( sister to Reinald and Edward) and Maria's sister Mathilde, wife of John II, Count of Blois.
In 1377, Emperor Charles IV granted Guelders to William's son William, but the title was not secured until 1379.
Among other territories, William acquired Monschau- Montjoie, Randerath and Linnich.
John II of Loon
John II( Johann II),( d. 1438), Lord of Jülich, Heinsberg and Löwenberg(" Herr zu Julich und Heinsberg"), son of Godfrey de Heinsberg, Count of Looz, and Philippa of Jülich, daughter of William V, Duke of Jülich, and Joanna of Hainaut.
Although John was the first son of Godfrey, he did not inherit the countship of Looz, the title instead going to Arnold of Rumingy.
John married first Margaret( Margareta van Gennep, d. 1419), Countess of Solms- Braunfels, and second Anna of Solms( d. 1433).
John and Margaret had four children: John and Anna had two children:
Among the descendants of John( through Maria of Loon- Heinsberg) were Juliane of Nassau- Dillenburg and William the Silent, Prince of Orange.
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.
Joanna of Hainaut
Joanna of Hainault( 1315–1374) was a Duchess of Jülich by marriage to William V, Duke of Jülich.
She was the third daughter of William I, Count of Hainaut, and Joanna of Valois.
She was a younger sister of Philippa of Hainault, Queen of England, and Margaret II of Hainault.
Marie Eleonore of Cleves
Duchess Marie Eleonore of Cleves (16 June 1550 – 1 June 1608) was a Duchess consort of Prussia by marriage to Albert Frederick, Duke of Prussia.
She was the eldest child of William, Duke of Jülich-Cleves-Berg and Maria of Austria.
Magdalene of Bavaria
Magdalene of Bavaria (4 July 1587 – 25 September 1628) was a princess member of the House of Wittelsbach by birth and Countess Palatine of Neuburg and Duchess of Jülich-Berg by marriage.
She was born in Munich, Bavaria, the tenth and youngest child of William V, Duke of Bavaria and Renata of Lorraine.
Gerhard V of Jülich
Gerhard V of Jülich (before 1250 – 29 July 1328), 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.
Gerhard succeeded his brother Walram as Count of Jülich in 1297.
He supported King Adolf in the Battle of Göllheim in 1298, but when Adolf was killed by King Albert I, Gerhard submitted to Albert and was allowed to keep his imperial fief.
He helped Albert against the Rhenish electors in 1300, which confirmed his interests with respect to Cologne.
Gerhard also won the river duties of Kaiserswerth, Mönchen-Gladbach, Kessel-Grevenbroich, Rheydt, Münstereifel/Bergheim and Müllenark, among others.
In 1313, Gerhard supported Ludwig IV in the succession war for the throne of Germany and allowed Ludwig's coronation in Aachen against the will of the Archbishop of Cologne.
Gerhard VII, Duke of Jülich-Berg
Gerhard VII, Duke of Jülich- Berg( – 19 August 1475) was the son of William VIII of Jülich, Count of Ravensberg and Adelheid of Tecklenburg.
Gerhard was the second duke of the combined Duchy of Jülich- Berg but the 7th Gerhard in the House of Jülich.
Upon his father's death in 1428, Gerhard became Count of Ravensberg.
In 1437, his uncle Adolf died without heirs and Gerhard inherited his title as Duke of Jülich- Berg.
Gerhard continued his uncle's fight for the dukedom of Guelders, supported by King Albert II of Germany.
In 1444 he won the Battle of Linnich but was unable to prevail in his fight for Guelders and ultimately sold his claim to Burgundy and acquired Blankenheim- Löwenberg and Heinsberg from Guelders.
He was increasingly unable to govern his territories after 1461.
His spouse Sophie of Saxe- Lauenburg then wielded regency for him.
William IV, Duke of Jülich-Berg
William IV of Jülich- Berg( 9 January 1455 – 6 September 1511) was the last ruler of the Duchy of Jülich- Berg.
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.

Question: When was William V, Duke Of Jülich's father born?
Answer: 1250