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So this is something I've been wondering about for a while.
Let's say john of gaunt and Constance of Castile have a surviving a son and that gaunt is successful in taking Castile, what would the effects of this be?
Would this butterfly away Henry of Bolingbroke exile and subsequent usurpation?
What would gaunt be like as king? And could we see a marriage between his son and Beatrice of Portugal?