Wikidata entity: Q2449360 P569 (date of birth): 0915-01-01 | P570 (date of death): 0980-01-01
| P40 | child | ... | Q2261399 (Hildouin III, Count of Ponthieu) | Hildouin III, Count of Ponthieu |
| P40 | child | ... | Q75255655 (Arnulf II, Comte de Boulogne) | Arnulf II, Comte de Boulogne |
| P735 | given name | ... | Q12344159 (William) | William |
| P31 | instance of | ... | Q5 (human) | human |
| P21 | sex or gender | ... | Q6581097 (male) | male |
| P26 | spouse | ... | Q76079652 (Mathilde van Vlaanderen, Comtesse de Boulogne) | Mathilde van Vlaanderen, Comtesse de Boulogne |
| P7929 | Roglo person ID | p=guillaume;n=de ponthieu;oc=1 |
| P4638 | The Peerage person ID | p1544.htm#i15438 |
| P4159 | WeRelate person ID | Guillaume_De_Montreuil_(1) |
| P2949 | WikiTree person ID | Ponthieu-59 |
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