Gilbert of Gloucester de Clare 5th Earl of Gloucester  24
- Born: Abt 1180, Hertford, Hertfordshire, England
- Marriage: Isabella Marshal Lady  on 9 Oct 1217 in Tewkesbury Abbey, Gloucester, England
- Died: 25 Oct 1230, Penros, Brittany about age 50
- Buried: Tewkesbury, Gloucester, England
Earl of Hertford. Clare; Tonbridge; St. Hilary; half ( Gifford, Gloucester,
Glamorgan, Gwynllwg). Some sources say married Isabella 1214.
The Complete Peerage vol.V,pp694-6.
Noted events in his life were:
• Acceded, 1217.
Gilbert married Isabella Marshal Lady  [MRIN: 2451], daughter of William Marshal 1st /4th Earl of Pembroke  and Isabel de Clare Countess Strigoil , on 9 Oct 1217 in Tewkesbury Abbey, Gloucester, England. (Isabella Marshal Lady  was born on 9 Oct 1200 in Pembroke Castle, Wales, died on 17 Jan 1240 in Berkhamsted Castle, Herts and was buried in Beaulieu Abbey, Hampshire.). The cause of her death was Died in Childbirth.