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What would happen if a loyal servant managed to spirit away Gwenllian of Wales either just after her fathers death, or just after the death of her uncle, hence keeping a legal heir to Wales alive and out of reach from the English?
First question would be, where to take her to raise her ... Brittany?, second question would be what would her survival and breeding somewhere (marrying into a noble/royal family somewhere) do to English hold over Wales? That with her claim becoming a convenient vehicle for any wars against England, most likely in the hands of the French, for raising Welsh rebels.