Mahaut de Béthune was born circa 1220 in Béthune to Robert VII de Béthune (1200-1248) and Isabeau de Morialmé (1198-1253) and died 15 November 1264 of unspecified causes. She married Gui de Dampierre (1225-1305) June 1246 JL .
Children
| Name | Birth | Death | Joined with |
| Marie of Flanders (-1297) | |||
| Robert III of Flanders (1249-1322) | 1249 | 17 September 1322 Ieper, West Flanders, Flanders, Belgium | Blanche of Naples (1250-1269) Yolande de Nevers (1247-1280) |
| Guillaume de Dampierre (aft1249-1311) | 1249 | 1311 | Alix de Clermont (c1270-1320) |
| John of Flanders (1250-1290) | |||
| Baldwin of Flanders (1252-1296) | |||
| Margaretha van Vlaanderen (c1251-1283) | 1251 | 3 July 1285 | Jan I van Brabant (1253-1294) |
| Beatrijs van Vlaanderen (c1253-1296) | 1253 | 1296 | Floris V van Holland (1254-1296) |
| Philip of Flanders (c1263-1318) | |||
Footnotes (including sources)
| ‡ General |