Individual Details

Isabel was the daughter of Sir William Marshal, Earl of Pembroke, Mareschal of England, and his wife Isabel de Clare.

Isabel married Gilbert de Clare, seventh earl of Clare and fifth earl of Hertford, on October 9, 1217. This was soon after her father had captured Gilbert at the battle of Lincoln in May 1217. Gilbert was thirty-seven years old, but Isabel’s age in not known. Between 1217 and 1230, when Gilbert died, they had six children. These children were: Richard (d1262) who married Margaret, daughter of Hubert de Burgh, and secondly Maud, daughter of John de Lacy; William (dsp 1258); Gilbert (dsp?); Amicia (d1283) who married Baldwin de Redvers; Agnes (dsp 1226); and Isabel (d?) who married Robert de Brus. In April 1231, William the younger married his sister Isabel, widow of Gilbert de Clare, to Richard earl of Cornwall and brother to King Henry III. Isabel died in October 1239, and her grandson Gilbert "The Red" inherited her lands as well as the de Clare lands on the death of his father, Richard, in 1262.

Isabel died of liver failure, contracted while in childbirth, on 17 January 1240, at Berkhamsted Castle. She was 39 years old. As Isabel was dying she asked to be buried next to her first husband at Tewkesbury Abbey, but Richard had her interred at Beaulieu Abbey, with her infant son, instead. As a pious gesture, he sent her heart, in a silver-gilt casket, to Tewkesbury Abbey.

Birth	9 Oct 1200	Pembroke Castle, Pembrokeshire, Wales
Marriage	9 Oct 1217	Tewkesbury Abbey, Gloucester, England - Sir Gilbert de Clare Magna Carta Baron
Marriage	30 Mar 1231	Fawley, Buckinghamshire, England - Sir Richard Plantagenet
Death	17 Jan 1239/40	Berkhamsted, Hertfordshire, England

Spouse	Sir Gilbert de Clare Magna Carta Baron (1182 - 1230)
Child	Sir Richard de Clare (1222 - 1262)

Spouse

Sir Richard Plantagenet (1209 - 1272)

Father	Sir William Marshal the Protector, Earl of Pembroke, Magna Carta Baron (1147 - 1219)
Mother	Isabel de Clare (1172 - 1220)
Sibling	Maud Marshal (1192 - 1248)
Sibling	William Marshal (1190 - 1231)