Arnold V, Count of Loon
Arnold V de Looz,( died August 22, 1327) was Count of Loon from 1279 to 1323 and Count of Chiny( Arnulf III) from 1299 to 1310.
He was the son of John I, Count of Looz and Mathilde Jülich.
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 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.
Marie, Countess of Ponthieu
Marie of Ponthieu( 17 April 1199 – 21 September 1250) was" suo jure" Countess of Ponthieu and Countess of Montreuil, ruling from 1221 to 1250.
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.
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.
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.
Anne de Bourbon
Anne de Bourbon (1380 – September 1408) was a daughter of John I, Count of La Marche and his wife Catherine of Vendôme.
She was a member of the House of Bourbon.

Question: What is the date of death of John I, Count Of Ponthieu's father?
Answer: 25 December 1147