Margaret II de Hainaut was born 2 June 1202 to Baldwin I of Constantinople (1172-1205) and Marie de Champagne (c1174-1204) and died 10 February 1280 Ghent, East Flanders, Flanders, Belgium of unspecified causes. She married Bouchard IV d'Avesnes (1182-1244) 1212 JL . She married Guillaume II de Dampierre (1196-1231) 1223 JL .
Children
| Name | Birth | Death | Joined with |
| Baudouin d'Avesnes (?-1219) | |||
| Jan I van Avesnes (1218-1257) | 1 May 1218 Houffalize, Belgium | 24 December 1257 Valenciennes, France | Aleid van Holland (bef1234-1284) |
| Baudoin d'Avesnes (1219-1289) | 1 September 1219 | 10 April 1295 | Felicite de Coucy (c1225-1307) |
| Name | Birth | Death | Joined with |
| Guillaume III de Dampierre (1224-1251) | |||
| Gui de Dampierre (1225-1305) | 1225 | 7 March 1304 Compiègne, France | Mahaut de Béthune (c1220-1264) Isabella von Luxemburg (1247-1298) |
| Jean I de Dampierre (?-1258) | |||
| Jeanne de Dampierre (c1226-c1275) | 1224 | 1275 | Hugues III de Rethel Thiébaut II de Bar (c1221-1291) |
Footnotes (including sources)
| ‡ General |
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