Isabelle de Châtillon was born circa 1300 to Jacques I de Châtillon (c1255-1302) and Catherine de Condé (c1270-aft1329) and died 1360 of unspecified causes. She married Guillaume I de Coucy (1288-1335) 1311 JL .
Children
| Name | Birth | Death | Joined with |
| Enguerrand VI de Coucy (1313-1346) | 1313 | 26 August 1346 Crécy-en-Ponthieu, France | Katharina von Habsburg (1320-1349) |
| Jean of Havrincourt | |||
| Raoul de Montmirail (c1317-aft1389) | 1317 | 1389 | Jean d'Harcourt |
| Guy de Coucy | |||
| Aubert de Drosnay | |||
Footnotes (including sources)
| ‡ General |
| ¶ Death |
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