- singleschatten.com ladyisabell/Isabel Neville, Duchess of Clarence (1451-1476). Isabella of Gloucester and Hertford (1226-1264). Isabella FitzRoy, Duchess of Grafton (1668-1723).
- alphapedia.ru w/Isabella_of_Gloucester_and_…
- http://geocitiessites.com heartland/Bluffs/2806/b11.htmShe died in 1257. (age 15 Weeks) Parents: Richard de CLARE Earl of Gloucester and Hertford and Maud de LACY.
- encyclopedia.com history/encyclopedias-almanacs-…Isabella, also known as Avice or Hawisa, was the youngest daughter and co-heiress of William, 2nd earl of Gloucester.Bulunamadı: hertford
- adventuresofatudornerd.com tag/isabel-of-…...de Coucy, Philippa de Coucy, Catalina of Lancaster, Constance of York, Joan Beaufort, Anne of Gloucester, Joan of Gloucester, and Isabel of Gloucester.Bulunamadı: hertford
- britannica.com biography/Isabella-of-Gloucester...where Isabella of Gloucester is discussed: John: Youth and rivalry for the crown: …year, and was married to Isabella, heiress to the earldom of Gloucester.Bulunamadı: hertford
- WikiMili.com en/Earl_of_Gloucester"Clare, Gilbert de [called Gilbert the Red], seventh earl of Gloucester and sixth earl of Hertford". Oxford Dictionary of National Biography (online ed.).
- thetimelinegeek.com isabella-of-gloucester-1173-…A timeline chronology of the life of Isabella of Gloucester first wife of King John who was divorced and married twice more.Bulunamadı: hertford
- famousfix.com list/earls-of-gloucesterRichard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester (4 August 1222 – 14 July 1262) was son of Gilbert de Clare, 4th Earl of Hertford and Isabel Marshal.