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The Earl of March, Roger Mortimer, through whose eldest daughter, the York family claimed descent, had a brother, Edmund. Edmund married Catrin, (eldest) daughter of the Welsh rebel prince, Owain Glyndŵr. I can't seem to find if they had children, but I was wondering something: what if Catrin Glyndŵr married the earl of March instead? True, it probably means a different lineup of children, but let's say she gives him a son and a daughter. The son succeeds as Earl of March, while the daughter marries the earl of Cambridge - son of the duke of York. The new earl of March dies without issue - it's the HYW so it's not uncommon (plus there's bubonic plague and general poor health that can carry him off instead), and the house of York inherits the Mortimer claim to the English throne plus whatever rights Glyndŵr may have had in Wales.

The York estates in England and Ireland, plus a blood link to the Welsh rebel-prince, could it make the house of York a threat to the English crown on the Lancaster brow?
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