Question: Who is the paternal grandfather of Adolf Iv, Count Of Berg?

Knowledge 1: Adolf IV, Count of Berg
Adolf IV of Berg count of Berg from 1132 until 1160 and of Altena (died after 1161), son of Adolf III of Berg count of Berg and Hövel.He married (1st)Adelheid von Arnsberg, a daughter of Heinrich count von Rietberg; then (2nd)Irmgard  von Schwarzenberg, a daughter of Engelbert von Schwarzenberg.He built the Schloss Altena, and built Altenberg Abbey (1133) where he enters in 1160.He has issue from his first marriage:
and from his second marriage: [SEP] Knowledge 2: Adolf III of Berg
Adolf III of Berg (1080 – 12 October 1152) was count of Berg from 1093 until 1132, and count of Hövel from 1090 until 1106, and Vogt of Werden.He was the son of Adolf II of Berg-Hövel, count of Berg, and Adelaide of Lauffen.He married Adelheid of Cleves (von Kleve), a daughter of Dietrich II count of Cleves (died 1118).They had issue:
Knowledge 1: 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. [SEP] Knowledge 2: William I of Berg
William I of Berg( c. 1242 – 16 April 1308) was the son of Count Adolf VII of Berg and of Margaret of Hochstaden.Upon the death of his brother, Count Adolf VIII of Berg, William succeeded as Count of Berg.Formerly serving as a monk, he was absolved of his religious vows by the pope in order to take the position.His tenure was notable due to increased and constant conflict with the Archbishop of Cologne.In 1300 he supported King Albert I of Germany against the Rhenish electors which further strengthened his position against the archbishop.During his life he started foundations for monasteries and churches, including those in Beyenburg( now part of Wuppertal) and Gräfrath.He was also served as the benefactor of the citizens of Hückeswagen.William married Irmgard of Cleves(? –11 May 1319), widow of Conrad I of Saffenburg and daughter of Dietrich VI, Count of Cleves.William and Irmgard are buried in the Berg family vault of the Altenberg Cathedral.As William had no children, his nephew Adolf IX of Berg, son of his brother Henry of Berg, Lord of Windeck succeeded him as Count of Berg.
Knowledge 1: 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. [SEP] Knowledge 2: Henry of Berg, Lord of Windeck
Henry of Berg, Lord of Windeck( bef. 1247 – 8 March 1290/ 96) was the son of Adolf VII of Berg and Margaret of Hochstaden.He was the younger brother of Adolf VIII of Berg and William I of Berg. From 1271- 1281Henry served as a governor for his brother Adolf who became Count of Berg in 1259.Henry and his brother Adolf supported John I, Duke of Brabant in his succession war for the Duchy of Limburg, which culminated in the Battle of Worringen in 1288.Henry resided at Windeck castle, probably as an official of his brother.Windeck was one of the four main Berg castles, which had come into the possession of Berg by 1247.Henry is buried with other members of the house of Berg at Altenberg Cathedral.

Answer: Adolf II of Berg