Gruffydd ab Owain, one of the sons of Owain Brogyntyn Lord of Edernion, held a moiety of his father's lordship. His wife was Janet the daughter of Sir William Say, Knt. Janet's sister Beatrice and co-heir married Geoffrey Fitz-Piers, Chief Justice of England Sheriff of Shropshire in 1207. Gruffydd and Janet Say had a son named David ab Gruffyd ab Owain who married Eva verch Llewelyn ab Gruffyd (Lord of Eyton).
Father: Owain BROGYNTYN , of Edeirnion & Dinmael b: ABT 1143 in Edeirnion, Denbighshire, Wales
Mother: Margaret verch EINION b: ABT 1145 in Matharfarn, Anglesey, Wales
Marriage 1 Janet de SAY b: ABT 1172 in Sawbridgeworth, Bishop's Stortford, Hertfordshire, England
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