1. HELGAUD¹ was born between 816 and 912, and died in 926^[4].
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2

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HERLOUIN II2, d. in 945.

2. HERLOUIN II² (Helgaud¹), son of (1) Helgaud¹ _____, was born between 835 and 927, and died in 945^[4]. ^[4]
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3

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ROGER3, d. after 957.

3. ROGER³ (Herlouin II², Helgaud¹), son of (2) Herlouin II² _____, was born between 849 and 946, and died between 957 and 1055^[4]. ^[4]
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4

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GUILLAUME I4, d. in 965.

4. GUILLAUME I⁴ (Roger³, Herlouin II², Helgaud¹), son of (3) Roger³ _____, was born between 861 and 951, and died in 965^[4]. ^[4]
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5

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HILDOUIN5, d. after 981.

5. HILDOUIN⁵ (Guillaume I⁴, Roger³, Herlouin II², Helgaud¹), son of (4) Guillaume I⁴ _____, was born between 871 and 966, and died between 981 and 1075. ^[4]
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6

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COUNT HUGUES I6 DE PONTHIEU, m. (U-14) GISELE OF FRANCE, daughter of (U-11) King Hugh Capet and (CH-6) Adelaide (of POITOU).

6. COUNT HUGUES I⁶ DE PONTHIEU (Hildouin⁵, Guillaume I⁴, Roger³, Herlouin II², Helgaud¹), son of (5) Hildouin⁵ _____, was born between 885 and 1032, and died between 936 and 1142. He married (U-14) GISELE OF FRANCE, daughter of (U-11) King Hugh Capet and (CH-6) Adelaide (of POITOU). ^[4]
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COUNT ENGUERRAND I7 DE PONTHIEU, d. in 1046; m. ADELE OF HOLLAND.

7. COUNT ENGUERRAND I⁷ DE PONTHIEU (Hugues I⁶, Hildouin⁵, Guillaume I⁴, Roger³, Herlouin II², Helgaud¹), son of (6) Count Hugues I⁶ and (U-14) Gisele (of FRANCE), was born between 936 and 1032, and died in 1046^[4]. He married ADELE OF HOLLAND.
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8

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COUNT HUGHES II8 DE PONTHIEU, d. in 1052; m. BERTHA DE AUMALE.

8. COUNT HUGHES II⁸ DE PONTHIEU (Enguerrand I⁷, Hugues I⁶, Hildouin⁵, Guillaume I⁴, Roger³, Herlouin II², Helgaud¹), son of (7) Count Enguerrand I⁷ and Adele (of HOLLAND) (BOULOGNE), was born between 950 and 1038, and died in 1052^[4]. He married BERTHA DE AUMALE.
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COUNT GUY I9 OF PONTHIEU of Ponthieu, France, d. in 1100; m. ADA.

9. COUNT GUY I⁹ OF PONTHIEU (Hughes II⁸, Enguerrand I⁷, Hugues I⁶, Hildouin⁵, Guillaume I⁴, Roger³, Herlouin II², Helgaud¹) of Ponthieu, son of (8) Count Hughes II⁸ and Bertha (de AUMALE), was born between 990 and 1053, and died in 1100^[1]. He married ADA. ^{[2, 3]}
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10

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AGNES10 OF PONTHIEU of Ponthieu, m. (ABD-10) COUNT ROBERT II DE BELLEME of Alencon, France, b. in 1035, d. in 1113, son of (ABD-5) Roger, Earl of Shrewsbury and (KI-5) Mabel (TALVAS).

10. AGNES¹⁰ OF PONTHIEU (Guy I⁹, Hughes II⁸, Enguerrand I⁷, Hugues I⁶, Hildouin⁵, Guillaume I⁴, Roger³, Herlouin II², Helgaud¹) of Ponthieu, daughter of (9) Count Guy I⁹ and Ada, was born between 1019 and 1080, and died between 1074 and 1190. She married (ABD-10) COUNT ROBERT II DE BELLEME of Alencon, son of (ABD-5) Roger, Earl of Shrewsbury and (KI-5) Mabel (TALVAS), who was born in 1035, and died in 1113. ^{[4, 2]}
dau. of Guy I, Count of Ponthieu, and a descendant of Hugh de Montgomery
Child: See (ABD-10) Count Robert II de BELLEME