Isabelle was born in 1379, the daughter of Dietrich van Horne and Isabelle de Châtillon. The place is not known.
Her husband was Gérard de Berlaymont. They were married, but the date and place have not been found. Their three known children were Gérard (>1380-?), Marie (1382-?) and Adrienne (?-1474).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | 1379 |
|