An Heir for Navarre

Juan II of Aragon was the father of the 3 Trastamara monarchs of Navarre - Carlos, King of Navarre, Blanca II and Leonor I, Queen of Navarre - he also withheld their rightful inheritance from them.

Carlos died childless after repeated attempts to remarry him (first to Isabella of Scotland then to Catherine of Portugal) foundered for 13 years. Blanca II was childless after 13 years of marriage to Enrique IV of Castile - and was found to still be a virgin after divorcing him. Plans to marry the divorced Blanca to the duke of Berry had likewise gone south due to her refusal.

Now, what if one of the five unions (OTL spouses counted) had been successful and produced heirs? Would there be an Aragon-Navarre? Castile-Navarre? A Valois Navarre?
 
Eventually, Navarre would have been swallowed up by one of its neighbours. Aragon, most liklely, would absord Navarre as it did several times already, more or less solving the problem, no really matter which line or who'd inherit.
 
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