Isabelle Capet-Dreux de Beu was born circa 1264 to Robert I de Châteaudun (1217-1264) and Isabelle la Chambellane de Villebéon (c1243-1288) and died 29 April 1300 of unspecified causes. She married Gaucher V de Châtillon (c1252-1329) 1278 JL .
Children
| Name | Birth | Death | Joined with |
| Gaucher VI de Châtillon (-1325) | |||
| Jean de Châtillon (-1363) | |||
| Hugues de Châtillon (-1336) | |||
| Jeanne de Châtillon (c1285-1354) | 1285 Châtillon-sur-Marne | 16 January 1354 | Gautier V de Brienne (c1278-1311) |
| Marie de Châtillon (-aft1318) | |||
| Isabelle de Châtillon | |||
Footnotes (including sources)
| ‡ General |