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In page Angharad ferch Llywelyn:

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Marared's daughter Angharad married Eleaonor's son Owain. Llywelyn, the son of this union, supposedly married Eleanor of Bar, an alleged daughter of Eleanor of England (King Edward I's daughter) and Henry the Count of Bar.[4] The son of Llywelyn was Thomas (or Tomos) ap Llywelyn, among whose children were the sisters Ellen and Margaret; Ellen was the mother of Owain Glyndŵr, while Margaret married Tudur ap Goronwy, from whom the House of Tudor descend (Margaret thus being the great-great-grandmother of King Henry VII).[citation needed]