Agnès was the daughter of Thiebaud de Dave and Jeanne de Forvie. The date and place of her birth have not been found.
She had two marriages/partners. Her first husband was Jean de Molembais. They were married, but the date and place have not been found. Their only known child was Arnould (?-<1394).
Her second husband was Henri de Donghelberghe. They were married, but the date and place have not been found. Their five known children were Ode (?-?), Jan (?-?), Henri (?-1448), Margriet (?-?) and Marie (?-?).
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | dame de Longchamps |