WI: Owain Glyndŵr's Daughter: Catrin, Countess of March?

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?
 
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?

Well, there's always Catrin's OTL childlessness - not sure who's fault this was since I can't even pinpoint a date for the marriage. That might be a problem, but assuming it was just that they didn't allow conjugal visits in the Tower, it might'nt be a problem. What will be a problem is that Henry IV/V will be lasering in on the Mortimers, in the event of a alt-Southampton Plot, since not only do they have a claim to the English throne but also a connection to the Welsh identity.

On the upside, though, should the Mortimer-Glendower match produce happy little babies, and they marry into the house of York as OTL (and that's a big if), then it might help in turning the Welsh to be pro-Yorkist/Mortimer rather than pro-Lancastrian.
 
Well, there's always Catrin's OTL childlessness - not sure who's fault this was since I can't even pinpoint a date for the marriage. That might be a problem, but assuming it was just that they didn't allow conjugal visits in the Tower, it might'nt be a problem. What will be a problem is that Henry IV/V will be lasering in on the Mortimers, in the event of a alt-Southampton Plot, since not only do they have a claim to the English throne but also a connection to the Welsh identity.

On the upside, though, should the Mortimer-Glendower match produce happy little babies, and they marry into the house of York as OTL (and that's a big if), then it might help in turning the Welsh to be pro-Yorkist/Mortimer rather than pro-Lancastrian.

I never thought about the Welsh becoming pro-Lancastrian vs. pro-Yorkist, actually.

But I could see your point with an alt-Southampton Plot. Both the Mortimers and the Yorks were up to their eyeballs in it, AFAIR. Would Henry IV try and marry this daughter - let's call her Katherine (after her mother) Mortimer - off to one of his supporters? Or make sure she got shut up in a nunnery? And what of her brother? IIRC, Henry V actually took an interest in the OTL young earl of Mortimer, would he do so here as well?
 
I never thought about the Welsh becoming pro-Lancastrian vs. pro-Yorkist, actually.

But I could see your point with an alt-Southampton Plot. Both the Mortimers and the Yorks were up to their eyeballs in it, AFAIR. Would Henry IV try and marry this daughter - let's call her Katherine (after her mother) Mortimer - off to one of his supporters? Or make sure she got shut up in a nunnery? And what of her brother? IIRC, Henry V actually took an interest in the OTL young earl of Mortimer, would he do so here as well?

Katherine Mortimer would make an interesting match for a Lancastrian. But by marrying her to the duke of Clarence, Bedford or Gloucester would simply mean that your alt-WotR (if it occurs) is between the main line Lancastrians and the cadet line. Either way, it might be safer to marry her to a minor pro-Henrician noble (baron or knight) or send her to a convent, than to anyone besides the Prince of Wales
 
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