Clémence d'Oisy was born 1110 to Hugues II d'Oisy (c1075-c1137) and Hildéarde de Mons (1085-) and died 1164 of unspecified causes. She married Guillaume I de Béthune (1095-1144) 1129 JL .
Children
| Name | Birth | Death | Joined with |
| Mathilde de Béthune (c1132-) | |||
| Robert V de Béthune (c1130-1191) | 1130 Béthune | 1191 | Adélaide de Saint-Pol (1130-c1177) |
| Benoît de Béthune | |||
Footnotes (including sources)
| ‡ General |
| Ω Birth |
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