Isabella married Edmund (Plantagenet), of Langley, 1st Duke of York on 11 July 1372 in Wallingford, Oxfordshire, England. Edmund (son of Edward III (Plantagenet), King of England and Philippa (Avesnes), of Hainault) was born on 5 June 1341 in Kings Langley, Hertfordshire, England; died on 1 Aug. 1402 in Kings Langley, Hertfordshire, England; was buried in Church of the Friars Preachers, Kings Langley, Hertfordshire, England. [Group Sheet] [Family Chart]

1. Edward (Plantagenet), of Norwich, 2nd Duke of York died on 25 Oct. 1415 in Azincourt, Pas-de-Calais, France.
2. Richard (Plantagenet), of Conisburgh, 3rd Earl of Cambridge was born circa 1375 in Conisbrough Castle, Conisbrough, Yorkshire, England; died on 5 Aug. 1415 in Southampton, Hampshire, England; was buried in Chapel of "God's House", Southampton, Hampshire, England.