Isabel Marshal was born 9 October 1200 to William Marshal, 1st Earl of Pembroke (1146-1219) and Isabel de Clare, 4th Countess of Pembroke (1172-1220) and died 17 January 1240 of unspecified causes. She married Gilbert de Clare, 5th Earl of Hertford (1180-1230) 8 October 1217 JL . She married Richard Plantagenet, 1st Earl of Cornwall (1209-1272) 30 March 1231 JL . Notable ancestors include Charlemagne (747-814), Hugh Capet (c940-996), Rurik (c832-879). Ancestors are from the United Kingdom, England, France, Germany, Belgium, Russia, Ukraine.


Offspring of Gilbert Clare and Isabel Marshal (1200-1240)
Name Birth Death Joined with
Agnes de Clare (1218-)
Amice de Clare (1220-1287)
Richard de Clare, 6th Earl of Hertford (1222-1262) 4 August 1222 15 July 1262 Megotta de Burgh
Maud de Lacy, Countess of Lincoln (1223-c1287)

Isabel de Clare (1226-1264) 2 November 1226 10 July 1264 Robert de Brus (c1210-1295)

William de Clare (1228-1258)
Gilbert de Clare (1229-)


Offspring of Richard of Cornwall and Isabel Marshal (1200-1240)
Name Birth Death Joined with
Henry of Almain (1235-1271)

Common ancestors of Isabel Marshal (1200-1240) and Gilbert de Clare, 5th Earl of Hertford (1180-1230)

  1. Adelaide de Vermandois (1064-1120)
  2. Adeline de Meulan (c1016-1081)
  3. Elizabeth de Vermandois (c1081-1131)
  4. Hugh de Vermandois (1053-1101)
  5. Robert de Beaumont (1049-1118)
  6. Roger I de Beaumont (1022-1094)

Footnotes (including sources)

‡ General



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