Question: Who is the paternal grandfather of Rotrou Iv, Count Of Perche?

Knowledge 1: Rotrou IV, Count of Perche
Rotrou IV (1135-1191), Count of Perche, son of Rotrou III, Count of Perche, and Hawise, daughter of Walter of Salisbury, and Sibilla de Chaworth.Rotrou was from the House of Châteaudun and descended from the Viscounts of Châteaudun.His mother was Hawise of Salisbury, a sister of Patrick of Salisbury, 1st Earl of Salisbury.Patrick’s sister Sibyll married John FitzGilbert, the Marshal of the Horses, whose son Henry was Bishop of Exeter and a knight in the service of Rotrou.Upon the death of his father in 1144, Rotrou continued the fight against his archenemy, William III Talvas, Count of Ponthieu and Lord of Alençon.Not withstanding a long-running blood feud, his uncle Patrick had married William Talvas' daughter Adela as her second husband.His mother Hawise and her second husband, Robert I of Dreux, served as regents at Perche until he reached the age of maturity.From 1152, he fought with Louis VII the Younger against Henry II of England in an ineffective war that saw their troops routed, lands ravaged and property stolen.He was forced to yield the communes of Moulins and Bonsmoulins to the crown England.Nevertheless, a matrimonial alliance with the House of Blois consolidated the declining power of the Counts of Perche.In 1189, Rotrou joined Philip II of France and Richard I the Lionheart in the Third Crusade.He died sometime after the Siege of Acre in 1191.In 1160, Rotrou married Matilda of Blois-Champagne, daughter of Theobald II, Count of Champagne, and Matilda of Carinthia.Rotrou and Matilda had:Rotrou was succeeded as Count of Perche by his son Geoffrey upon his death. [SEP] Knowledge 2: Rotrou III, Count of Perche
Rotrou III (bef. 1080 – 8 May 1144), called the Great ("le Grand"), was the Count of Perche and Mortagne from 1099.He was the son of Geoffrey II, Count of Perche, and Beatrix de Ramerupt, daughter of Hilduin IV, Count of Montdidier.He was a notable Crusader and a participant in the "Reconquista" in eastern Spain, even ruling the city of Tudela in Navarre from 1123 to 1131.He is commonly credited with introducing Arabian horses to the Perche, giving rise to the Percheron breed.By his creation of a monastery at La Trappe in memory of his wife, Matilda, daughter of Henry I of England, in 1122 he also laid the foundations of the later Trappists.
Knowledge 1: Rotrou III, Count of Perche
Rotrou III (bef. 1080 – 8 May 1144), called the Great ("le Grand"), was the Count of Perche and Mortagne from 1099.He was the son of Geoffrey II, Count of Perche, and Beatrix de Ramerupt, daughter of Hilduin IV, Count of Montdidier.He was a notable Crusader and a participant in the "Reconquista" in eastern Spain, even ruling the city of Tudela in Navarre from 1123 to 1131.He is commonly credited with introducing Arabian horses to the Perche, giving rise to the Percheron breed.By his creation of a monastery at La Trappe in memory of his wife, Matilda, daughter of Henry I of England, in 1122 he also laid the foundations of the later Trappists. [SEP] Knowledge 2: Geoffrey III, Count of Perche
Geoffrey III (died 1202), Count of Perche (1191-1202), son of Rotrou IV, Count of Perche, and Matilda of Blois-Champagne, daughter of Theobald II, Count of Champagne, and Matilda of Carinthia.He accompanied his father to the Third Crusade and participated in the Siege of Acre, where his father was killed.Back from the Holy Land, he sold more land to the abbeys in order to replenish his finances depleted by his participation in the crusade.He then fought Richard the Lionheart under the banner of the Philip II of France and in 1194, he managed to recover the commune of Bonsmoulins that his father had yielded to Henry II.When Richard sent an army to regain control of Normandy, Geoffroy, as a French army commander, helped defeat him.John Lackland, the brother and successor of Richard, was forced to renounce England's claim to Normandy in 1204.In 1202, Geoffrey and his brother Stephen decided to take part in the Fourth Crusade, but he died at Soissons before he could deploy.Geoffrey's first wife was named Matilda of which nothing is known.His second wife was Matilda of Saxony, daughter of Henry the Lion, Duke of Saxony and Bavaria, and Matilda, eldest daughter of Henry II, King of England, and Eleanor of Aquitaine.They married in 1189 in Rouen, and King Richard the Lionheart, uncle of the bride, granted them land in the counties of Suffolk, Essex and Kent previously owned by Henry of Essex.Geoffrey and his second wife Matilda had two children:
Geoffrey was succeeded as Count of Perche by his son Thomas upon his death.
Knowledge 1: Rotrou IV, Count of Perche
Rotrou IV (1135-1191), Count of Perche, son of Rotrou III, Count of Perche, and Hawise, daughter of Walter of Salisbury, and Sibilla de Chaworth.Rotrou was from the House of Châteaudun and descended from the Viscounts of Châteaudun.His mother was Hawise of Salisbury, a sister of Patrick of Salisbury, 1st Earl of Salisbury.Patrick’s sister Sibyll married John FitzGilbert, the Marshal of the Horses, whose son Henry was Bishop of Exeter and a knight in the service of Rotrou.Upon the death of his father in 1144, Rotrou continued the fight against his archenemy, William III Talvas, Count of Ponthieu and Lord of Alençon.Not withstanding a long-running blood feud, his uncle Patrick had married William Talvas' daughter Adela as her second husband.His mother Hawise and her second husband, Robert I of Dreux, served as regents at Perche until he reached the age of maturity.From 1152, he fought with Louis VII the Younger against Henry II of England in an ineffective war that saw their troops routed, lands ravaged and property stolen.He was forced to yield the communes of Moulins and Bonsmoulins to the crown England.Nevertheless, a matrimonial alliance with the House of Blois consolidated the declining power of the Counts of Perche.In 1189, Rotrou joined Philip II of France and Richard I the Lionheart in the Third Crusade.He died sometime after the Siege of Acre in 1191.In 1160, Rotrou married Matilda of Blois-Champagne, daughter of Theobald II, Count of Champagne, and Matilda of Carinthia.Rotrou and Matilda had:Rotrou was succeeded as Count of Perche by his son Geoffrey upon his death. [SEP] Knowledge 2: Geoffrey III, Count of Perche
Geoffrey III (died 1202), Count of Perche (1191-1202), son of Rotrou IV, Count of Perche, and Matilda of Blois-Champagne, daughter of Theobald II, Count of Champagne, and Matilda of Carinthia.He accompanied his father to the Third Crusade and participated in the Siege of Acre, where his father was killed.Back from the Holy Land, he sold more land to the abbeys in order to replenish his finances depleted by his participation in the crusade.He then fought Richard the Lionheart under the banner of the Philip II of France and in 1194, he managed to recover the commune of Bonsmoulins that his father had yielded to Henry II.When Richard sent an army to regain control of Normandy, Geoffroy, as a French army commander, helped defeat him.John Lackland, the brother and successor of Richard, was forced to renounce England's claim to Normandy in 1204.In 1202, Geoffrey and his brother Stephen decided to take part in the Fourth Crusade, but he died at Soissons before he could deploy.Geoffrey's first wife was named Matilda of which nothing is known.His second wife was Matilda of Saxony, daughter of Henry the Lion, Duke of Saxony and Bavaria, and Matilda, eldest daughter of Henry II, King of England, and Eleanor of Aquitaine.They married in 1189 in Rouen, and King Richard the Lionheart, uncle of the bride, granted them land in the counties of Suffolk, Essex and Kent previously owned by Henry of Essex.Geoffrey and his second wife Matilda had two children:
Geoffrey was succeeded as Count of Perche by his son Thomas upon his death.

Answer: Geoffrey II, Count of Perche