William married Isabella de Clare, Countess of Pembroke Aug 1189, London, England. Isabella (daughter of Richard FitzGilbert de Clare, 2nd Earl of Pembroke and Aoife MacMorrough) was born 1172, Ireland; died 1220; was buried Monmouthshire, Wales. [Group Sheet]

1. William Marshal, 5th Earl of Pembroke was born Abt 1190; died 24 Apr 1231; was buried London, England.
2. Richard Marshal, 6th Earl of Pembroke was born 1191; died 16 Apr 1234.
3. Maud Marshal, Countess of Norfolk Countess of Surrey was born 1192; died 27 Mar 1248; was buried Tintern, Monmouthshire, Wales.
4. Lady Isabella Marshal was born 09 Oct 1200, Pembroke, Pembrokeshire, Wales; died 17 Jan 1239/40, Hertfordshire, England; was buried Beaulieu, Hampshire, England.
5. Eve Marshal was born 1203, Pembroke, Pembrokeshire, Wales; died 1246.
6. Gilbert Marshal, 7th Earl of Pembroke died 27 Jun 1241.
7. Sibyl Marshal
8. Anselm Marshal, 9th Earl of Pembroke died 22 Dec 1245.
9. Johanna Marshal
10. Margaret Marshal
11. Walter Marshal, 8th Earl of Pembroke died 24 Nov 1245.

John — Sybil de Salisbury. [Group Sheet]

Gilbert — Margaret. [Group Sheet]

Walter — Sybil de Chaworth. [Group Sheet]