Gui de Dampierre, Count of Flanders, Margrave of Namur, was born circa 1225 to Guillaume II de Dampierre (1196-1231) and Margaret II, Countess of Flanders (1202-1280) and died 7 March 1304 Compiègne, France of unspecified causes. He married Mahaut de Béthune (c1220-1264) June 1246 JL . He married Isabella von Luxemburg (1247-1298) March 1256 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) | |||
| Name | Birth | Death | Joined with |
| Beatrix of Flanders (-1307) | 1307 | Hugh II de Châtillon (-1307) | |
| Margaret of Flanders (1272-1331) | 1272 | 1331 's Gravendal | Alexander of Scotland (1264-1284) Reinoud I van Gelre (c1255-1326) |
| Isabelle of Flanders (-1323) | |||
| Philippa of Flanders (-1306) | |||
| Jean I de Namur (1267-1330) | 1267 | 31 January 1330 | Marguerite de Clermont Marie d'Artois (c1291-1365) |
| Guy of Namur (-1311) | |||
| Henry of Flanders (-1337) | |||
| Jeanne of Flanders (-1296) | |||
Footnotes (including sources)
| ‡ General |
