William IV, Count of Nevers
William IV, Count of Nevers,( c. 1130 – Acre, 24 October 1168) Count of Nevers, Auxerre and Tonnerre( 1161 – 1168).
William, Margrave of Meissen
William IV, Count of Weimar( died 1062) was Margrave of Meissen from 1046 until his death.
William IV, Count of Ponthieu
William IV Talvas (1179 – October 4, 1221) was William III, Count of Ponthieu and William IV (of the house of Belleme/Montgomery).
He was Count of Ponthieu, ruler of a small province in northern France that fell under the suzerainty of the dukes of Normandy (later also kings of England)
since at least the mid 11th century.
He was son and heir of John I, Count of Ponthieu (died 1191) by his third wife Beatrice de St Pol.
Guy I, Count of Ponthieu
Guy I of Ponthieu( also known in the Bayeux Tapestry as Wido) was born sometime in the mid to late 1020s and died 13 October 1100.
He succeeded his brother Enguerrand as Count of Ponthieu.
Agnes, Countess of Ponthieu
Agnes of Ponthieu( c. 1080 – aft. 1105) was ruling Countess of Ponthieu from 1100.
She was the daughter of Count Guy I of Ponthieu.
Enguerrand, the son of Count Guy, died at a youthful age.
Guy then made his brother Hugh heir presumptive, but he also died before Guy( died 1100).
Agnes became count Guy's heiress, and was married to Robert of Bellême.
Their son William III of Ponthieu succeeded to the county of Ponthieu after the death of Agnes( between 1105 and 1111), and the imprisonment of his father in 1112.
William III, Count of Ponthieu
William III of Ponthieu( – 1172) also called William( II; III) Talvas.
He was seigneur de Montgomery in Normandy and Count of Ponthieu.
Guy II of Ponthieu
Guy II of Ponthieu( – 25 December 1147) was the son of William III of Ponthieu and Helie of Burgundy.
John I, Count of Looz
John I (Jean) (d. 1278 or 1279), Count of Looz and Count of Chiny, eldest son of Arnold IV, Count of Looz and Chiny, and Jeanne, Countess of Chiny.
He succeeded his father in 1272 or 1273, as the Count of Looz and Chiny.
Virtually nothing is known about his reign.
He first married, in 1258, Matilda, daughter of William IV, Count of Jülich, and Matilda of Gelderland.
Their children were:
Widowed, he married secondly, in 1269, Isabelle de Conde (d. after 1280), daughter of Jacques, Seigneur of Conde and Bailleul, and his wife Agnes of Rœulx.
Their children were::
Upon his death, he was succeeded as Count of Chiny by his brother Louis, and as Count of Looz by his son Arnold.
John I, Count of Ponthieu
John I of Ponthieu (– 1191) was the son of Guy II of Ponthieu and succeeded him as Count of Ponthieu in 1147.
Gisela of France, Countess of Ponthieu
Gisèle of France( ca. 968 – 1002) was the daughter of Hugh Capet and Adelaide of Aquitaine.
She married Count Hugh I of Ponthieu around 994.
Her children by Hugh included Enguerrand I of Ponthieu and Guy of Ponthieu.

Question: Who is the paternal grandfather of William Iv, Count Of Ponthieu?
Answer: Guy II of Ponthieu