Isabel married Marshal, Earl William on 8 Aug 1189 in London, Middlesex, England. William (son of Marshal, John FitzGilbert and de Salisbury, Sibyl) was born on 12 May 1146 in Pembroke, Pembrokeshire, Wales; was christened on 19 May 1146 in Pembrokeshire, Wales; died on 14 May 1219 in Caversham Manor, Caversham, Oxfordshire, England; was buried in Round Chapel of Knight's Temple, London, England. [Group Sheet] [Family Chart]

1. Marshall, Countess Matilda was born in Sep 1192 in Pembroke, Pembrokeshire, Wales; was christened between 8 Sep and 7 Oct 1201; died on 3 Apr 1248 in Tintern Abbey, Tintern, Monmouthshire, Wales; was buried on 11 Apr 1248 in Tintern Abbey, Tintern, Monmouthshire, Wales.
2. Marshal, Lady Eva was born on 16 Oct 1200 in Pembroke Castle, Pembroke, Pembrokeshire, Wales; was christened between 8 Apr and 7 May 1206 in St David's, Pembrokeshire, Wales; died in 1246 in Llanthony, Monmouthshire, Wales; was buried in 1246 in Abergavenny, Monmouthshire, Wales.
3. Marshal, Lady Joane was born in 1202 in Pembroke, Pembrokeshire, Wales; was christened in Pembroke, Pembrokeshire, Wales; died in 1234 in Pembroke, Pembrokeshire, Wales.