2nd son and co-heir, aged 10 years at the Inquisition taken after his father's death.
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Thomas was the representative in the senior line of the old royal family of Deheubarth, which claim his daughter Elen passed on to her son Owain Glyndwr, Prince of Wales. 3
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Griffith Hiraethog, who lived at the time of King Henry VIII, names “Owen and Thomas” as the sons of Llywelyn and his wife “the daughter of Sir Robert Y Val, Arglwydd Trefgarn Owen” 4