See also
1. Gilbert de Clare, 5th Earl of Hertford, son of Richard de Clare, 4th Earl of Hertford (1162-1218) and Amice FITZROBERT (c. 1160-1220), was born in 1180. He died on 25 October 1230. He married Lady Isabella Marshal of Pembroke.
Gilbert de Clare, 5th Earl of Hertford (1180 – October 25, 1230) was the son of Richard de Clare, 4th Earl of Hertford, from whom he inherited the Clare estates, from his mother, Amice Fitz Robert, 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 Isabella 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 Cranbourgh to Tewkesbury. His widow Isabel later married Richard Plantagenet, Earl of Cornwall & King of the Romans. His own arms were: Or, three chevronels gules.
Lady Isabella Marshal of Pembroke and Gilbert de Clare, 5th Earl of Hertford had the following children:
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2. Isabella de Clare, daughter of Gilbert de Clare, 5th Earl of Hertford and Lady Isabella Marshal of Pembroke, was born on 8 November 1226 in Gloucestershire. She married Robert de Brus, 5th Lord Annandale on 12 May 1240. She died on 10 July 1264.
Robert de Brus, 5th Lord Annandale and Isabella de Clare had the following children:
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3. Lord Robert de Brus, son of Robert de Brus, 5th Lord Annandale and Isabella de Clare, was born in 1210. He had the title 'Lord of Annandale'. He died on [Julian] 31 March 1295. He married Christina de Ireby.
Christina de Ireby and Robert de Brus had the following children:
| 5 | Robert le Brus (1243-bef1304). Robert was born in [Julian] 1243. He had the title 'Earl of Carrick'. He had the title 'Earl of Carrick, 6th Lord Annandale'. He died before [Julian] 4 April 1304. |
4. Isabel de Brus was the daughter of Robert de Brus, 5th Lord Annandale and Isabella de Clare.