| Male Guillaume I de Haverskerque de St-Omer, d'Abbeville |
| Birth | St-Omer, Pas de Calais, Nord Pas de Calais FRANCE  |
|
| Death | ca. 979 | St-Omer, Pas de Calais, Nord Pas de Calais, FRANCE |
| Burial | ||
| Marriage | Before 959 | Abbéville, Somme, Picardie FRANCE |
| Father | ||
| Mother | ||
 FemaleSybille de Ponthieu d'Abbéville |
| Birth | 21 Jan 930 | Abbéville St-Lucien, Oise, Hauts de France, FRANCE |
| Death | 21 Jan 975 | St-Omer, Pas de Calais, Nord Pas de Calais, FRANCE |
| Burial | ||
| Father | Guy I de Ponthieu, Comte de Ponthieu Comte de Montrueil | F740 Group Sheet | |
| Mother | Aliette de Gamache de Bayeux | F740 Group Sheet | |
 Male+ Flobert de Haverskerque |
| Birth | ca. 945 | |
| Death | ca. 6 Jan 1013 | |
| Burial | ||
| Spouse | Ermengarde de Valenciennes | F743 | |
| Marriage | ||
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