Simon married Eleanor Plantagenet, Countes of Pembroke / Countess of Leicester on 7 Jan 1239 in Kings Chapel, Palace of Westminster. Eleanor (daughter of John I Lackland Plantagenet, King of England and Isabella of Angoulême Taillefer, Queen of England) was born in 1215 in Gloucester, England; died on 13 Apr 1275 in Montargis Abbey, France; was buried in Montargis Abbey, France. [Group Sheet] [Family Chart]
Family/Spouse: Margaret Aldobrandeschi. Margaret (daughter of Aldobrandino Aldobrandeschi, Count of Aguillara) and died. [Group Sheet] [Family Chart]
Family/Spouse: Llywelyn (Llelo) the Last ap Gruffydd, Prince of Wales. Llywelyn (son of Gruffydd ap Llywelyn Fawr and Senena) was born in 1228; died on 11 Dec 1282. [Group Sheet] [Family Chart]
Family/Spouse: Philip of Cardigan ap Ivor, Lord of Iscoed Cardigan. Philip and died. [Group Sheet] [Family Chart]
Family/Spouse: Thomas ap Llewelyn, Lord of South Wales. Thomas (son of Llewelyn ap Owain, Lord of South Wales and Lady Eleanor of Bar) died about 1343. [Group Sheet] [Family Chart]