Family: 1st Earl of Pembroke William Marshall, the Elder / 4th Countess of Pembroke Isabella de Clare (F2729)
m. Aug 1189-
Male
1st Earl of Pembroke William Marshall, the Elder
Birth 12 May 1146 Pembrokeshire, Wales 
Death 14 May 1219 Caversham, Oxfordshire, England Burial Temple Church, London, England Marriage Aug 1189 Tower of London, London, England Father Mother
Female
4th Countess of Pembroke Isabella de Clare
Birth Feb 1172 Pembroke, Pembrokeshire, Wales Death 14 May 1220 Pembroke, Pembrokeshire, Wales Burial Father 2nd Earl of Pembroke, Lord of Leinster, and Justiciar of Ireland Richard FitzGilbert de Clare | F3257 Group Sheet Mother Princess of Leinster Aoife 'Eve' MacMurrough | F3257 Group Sheet
Female
Sibyl Marshall
Birth 1209 Pembroke, Pembrokeshire, Wales Death 27 Apr 1245 Pembroke, Pembrokeshire, Wales Burial Spouse 5th Earl of Derby Sir William de Ferrers, III | F5202 Marriage
Female
Countess of Cornwall Isabel Marshall
Birth 9 Oct 1200 Pembroke, Pembrokeshire, Wales Death 17 Jan 1240 Hertfordshire, England Burial Hampshire, England Spouse 1st Earl of Cornwall Richard Plantagenet | F7487 Marriage 30 Mar 1231 Buckinghamshire, England Spouse 4th Earl of Hertford and 5th Earl of Gloucester Gilbert de Clare, III | F7486 Marriage 9 Oct 1217
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