- Born: 1392, Eyton, Herefordshire, England 1
- Married: After 1404
sister and co-heir of Richard Oldcastle (d. 1421) 1
Gwenllian married Sir Robert II WHITNEY, son of Sir Robert I WHITNEY of Whitney-on-Wye and Maud/Mary CROMWELL, after 1404. (Robert WHITNEY was born about 1379 in Whitney-on-Wye, Herefordshire, England and died on 12 Mar 1443 in Whitney-on-Wye, Herefordshire, England.)
1 The History of Parliament: British Political, Social and Local History, Sir Robert II WHITNEY of Whitney-on-Wye and Pencombe, Herefs.