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http://en.wikipedia.org/wiki/Gilbert_de_Clare,_5th_Earl_of_HertfordSir Knight
5th Earl of Clare, Hertford and Gloucester
Gilbert de Clare, 5th Earl of Hertford was the son of
Richard de Clare, 4th Earl of Hertford, from whom he inherited the Clare estates, from his mother, Amice Fitz William, the estates of Gloucester and the honour of St. Hilary, and from Rohese, an ancestor, the moiety of the Giffard estates. In June 1202, he was entrusted with the lands of
Harfleur and
Montrevillers.
In 1215 Gilbert and his father were two of the barons made
Magna Carta sureties and championed
Louis "le Dauphin" of France in the
First Barons' War, fighting at
Lincoln under the baronial banner. He was taken prisoner in 1217 by
William Marshal, whose daughter
Isabel he later married.
In 1223 he accompanied his brother-in-law,
Earl Marshal, in an expedition into Wales. In 1225 he was present at the confirmation of the Magna Carta by
Henry III. In 1228 he led an army against the Welsh, capturing
Morgan Gam, who was released the next year. He then joined in an expedition to
Brittany, but died on his way back to Penrose in that duchy. His body was conveyed home by way of
Plymouth and
Cranborne to
Tewkesbury. His widow Isabel later married
Richard Plantagenet, Earl of Cornwall & King of the Romans. His own arms were: Or, three chevronels gules.
Hertford had six children by his wife
Isabel, née Marshal:
[1] ▪ Agnes de Clare
▪ Amice de Clare , who married the
6th Earl of Devon ▪ Richard de Clare ▪ Isabel de Clare , who married the
5th Lord of Annandale ▪ William de Clare
▪ Gilbert de Clare