Question: Who is the mother of William Vii Of Jülich, 1St Duke Of Berg?

Knowledge 1: William VII of Jülich, 1st Duke of Berg
William VII of Jülich, 1st Duke of Berg (– 25 June 1408) was born in Jülich, as the son of Gerhard VI of Jülich, Count of Berg and Ravensberg, and Margaret, daughter and heiress of Otto IV, Count of Ravensberg, and Margaret of Berg.Upon his father's death in 1360, William became Count of Berg and Ravensberg, a title that his father had gained by marrying the heiress of Berg and Ravensberg.In 1380, King Wenzel elevated him to the rank of Duke, thus becoming the first Duke of Berg.William fought the counties of Mark and Cleves to prevent them from combining but in 1397 he was taken prisoner in the battle of Kleverhamm.He lost Remagen, Kaiserwerth and Sinzig to his nephew Adolf IV, Count of Kleve-Mark and due to these losses, his sons turned against him and imprisoned him in 1403/04.He ultimately forced them to submit and later supported his brother-in-law Rupert, King of Germany against Guelders-Jülich and won the county of Blankenburg.William died on 25 June 1408 and is buried in the Abteikirche in Altenberg. [SEP] Knowledge 2: Gerhard VI of Jülich, Count of Berg and Ravensberg
Gerhard VI of Jülich, Count of Berg and Ravensberg (– 18 May 1360) was the son of William V, Duke of Jülich and Joanna of Hainaut.Gerhard was betrothed in 1333 (renewed 1342) to Margaret of Guelders, daughter of Rainald II of Guelders and Sophia Betrout.However, this marriage was never consummated, likely due either to Rainald's death in 1343 or Margaret's death in 1344.<br>Gerhard was subsequently married about 1344 to Margaret of Ravensberg, heiress of Berg and Ravensberg (died 13/19 February 1389), daughter of Otto IV, Count of Ravensberg and Margaret of Berg.Margaret's father Otto had no sons so at his death in 1328, the County of Ravensberg went to his brother Bernhard.However, when Bernhard died in 1346 without issue, Margaret became the heir of Ravensberg, her elder sister Hedwig having died in 1336.<br>Then, when Margaret's uncle, Count Adolf IX of Berg, died in 1348 without issue, Margaret also inherited Berg by right of her mother.Thus, the titles to Berg and Ravensberg came into the house of Jülich where they remained until 1511 when they passed into the house of Cleves.Gerhard completed several ineffective protective alliances and stood against the Archbishop of Cologne.He won Hardenberg, Neviges, Langenberg, Remangen and Kaiserswerth, among others.Gerhard died 18 May 1360 in a tournament in Düsseldorf and is buried with his wife in the Altenberg Abbey.
Knowledge 1: William VII of Jülich, 1st Duke of Berg
William VII of Jülich, 1st Duke of Berg (– 25 June 1408) was born in Jülich, as the son of Gerhard VI of Jülich, Count of Berg and Ravensberg, and Margaret, daughter and heiress of Otto IV, Count of Ravensberg, and Margaret of Berg.Upon his father's death in 1360, William became Count of Berg and Ravensberg, a title that his father had gained by marrying the heiress of Berg and Ravensberg.In 1380, King Wenzel elevated him to the rank of Duke, thus becoming the first Duke of Berg.William fought the counties of Mark and Cleves to prevent them from combining but in 1397 he was taken prisoner in the battle of Kleverhamm.He lost Remagen, Kaiserwerth and Sinzig to his nephew Adolf IV, Count of Kleve-Mark and due to these losses, his sons turned against him and imprisoned him in 1403/04.He ultimately forced them to submit and later supported his brother-in-law Rupert, King of Germany against Guelders-Jülich and won the county of Blankenburg.William died on 25 June 1408 and is buried in the Abteikirche in Altenberg. [SEP] Knowledge 2: Adolf IX of Berg
Adolf IX of Berg( also referred to as Adolf VI)( c. 1280 – 3 April 1348) was the eldest son of Henry of Berg, Lord of Windeck and Agnes of the Mark.In 1308, Adolf succeeded as Count of Berg upon the death of his uncle William I of Berg who had no children.Adolf was an important and loyal supporter of Ludwig IV of Bavaria, helping him since 1314 in the war of succession.As a result of Adolf's 1312 marriage to Agnes of Cleves, he received the Rhine customs of Duisberg as a dowry and these were confirmed as an imperial fief by Emperor Louis in 1314.He continued the constant feuds between the House of Berg and the Archbishops of Cologne.In 1327/ 28, he joined Louis on his trip to Rome where he was crowned as Emperor.Adolf received the privilege to mint silver which he did at Wipperfürth.In 1337 Adolf joined the English- German Alliance which caused the start of the Hundred Years' War.In 1312 Adolf was married to Agnes of Cleves( c. 1295 – aft. 1361), daughter of Dietrich VII, Count of Cleves and Margaret of Habsburg- Kiburg.He died on 3 April 1348 without children and was succeeded by his only surviving niece, Margaret of Ravensberg by right of her mother, and her husband Gerhard VI of Jülich as Count and Countess of Berg.Thus, the Counties of Berg and Ravensburg came in 1348 under the house of Jülich, and were in 1437 united with the County of Jülich.In 1511 all three passed into the house of Cleves.
Knowledge 1: William VII of Jülich, 1st Duke of Berg
William VII of Jülich, 1st Duke of Berg (– 25 June 1408) was born in Jülich, as the son of Gerhard VI of Jülich, Count of Berg and Ravensberg, and Margaret, daughter and heiress of Otto IV, Count of Ravensberg, and Margaret of Berg.Upon his father's death in 1360, William became Count of Berg and Ravensberg, a title that his father had gained by marrying the heiress of Berg and Ravensberg.In 1380, King Wenzel elevated him to the rank of Duke, thus becoming the first Duke of Berg.William fought the counties of Mark and Cleves to prevent them from combining but in 1397 he was taken prisoner in the battle of Kleverhamm.He lost Remagen, Kaiserwerth and Sinzig to his nephew Adolf IV, Count of Kleve-Mark and due to these losses, his sons turned against him and imprisoned him in 1403/04.He ultimately forced them to submit and later supported his brother-in-law Rupert, King of Germany against Guelders-Jülich and won the county of Blankenburg.William died on 25 June 1408 and is buried in the Abteikirche in Altenberg. [SEP] Knowledge 2: William VIII of Jülich, Count of Ravensberg
William VIII of Jülich, Count of Ravensberg( – 22 November 1428) was the youngest son of William VII of Jülich, 1st Duke of Berg and Anna of the Palatinate.Along with his brother, Adolf, William rebelled against his father but surrendered in 1404 and received his father's title as Count of Ravensberg which he held until his death in 1428.In 1401, William was appointed Bishop of Paderborn by Pope Boniface IX through the influence of his uncle, Rupert, King of Germany.William's elder brother Rupert had held the same post from 1389 – 1394.Like his uncle, King Rupert, William was a follower of the Roman Popes.As Prince- Bishop, William aroused heavy unrest with his ecclesiastical reform effort and quarreled with Waldeck and Lippe, compelling acknowledgement of Paderborn's sovereignty over parts of Lippe.Despite territorial policy successes, he faced opposition and renounced Paderborn in 1414.He attempted to become Archbishop of Cologne but failed against Dietrich of Moers who also replaced William as Bishop of Paderborn.William then married Dietrich's niece, Adelheid of Tecklenburg, and became the father of the new line of the Dukes of Jülich- Berg and Counts of Ravensberg, when his brother Adolf died without an heir.William and Adelheid are buried in the Stiftskirche in Bielefeld.

Answer: Margaret of Ravensberg