WI King Joao I lost battle of Aljubarrota in 1385?

On 14 August 1385 Joao Master of Aviz bastard son of King Peter I of Portugal leading an army of 6500 soldiers clashed with the Castillian army of 30000 under King Juan I...
Despite being hugely outnumbered Joao managed to win the battle and secure his posistion as King Joao I against Juan's I claims...
WI Joao lost the battle and the "Portuguese Crisis" continue?? Would Juan I been able to incorporate Portugal to Castille? How is this altering History? Any thoughts?
 
Loosing the "Batalha de Aljubarrota" would mean the end of the Portuguese independent kingdom with its incorporation into Castille. That's a huge POD. No Discoveries down the African coast and to the Orient, till Japan, by the Portuguese navy. Columbos was rejected by the Spanish court before being turned down by the Portugue King after which he returned to Spain. Without Portugal he would probably give up or seek help somewhere else. Either way the discovery of America and the European expansion started by the Iberic kigdoms would start much later and be done by someone else (The English, the French and/or the Dutch). AH No Brazil also so... no Brazilian Carnival...
 
I don't think that Portugal would be incorporated into Castille. Juan I was not defending "his" claims to throne, but his wife's claims, Beatrice of Portugal. She was his second wife, and he already had two sons from Leonor of Aragon: Henry (who would become king of Castille) and Ferdinand (who became king of Aragon). IOTL he had a son with Beatrice, Miguel, who died in infancy. If the Castillians had won Aljubarrota, and Miguel had survived we wouldn't have a union of Castille and Portugal, but a dynastical change, with a Trastamara king in Portugal, Miguel I.

Even if their son do not survive as IOTL Juan's claim would be so weak that he could probably support one of Beatrice's uncles, John and Dinis, who were sons of Peter I of Portugal and Ines de Castro. They supported Juan I in his war against the Master of Aviz (the future John I of Portugal), and so an alliance is not that unlikely if Beatrice has no children.

So probably the Portuguese independence is granted. But one thing that would probably be changed are the naval explorations. The victory of the House of Aviz was the victory of the Portuguese Bourgeoisie against the most powerful nobles. If the Castillians win then the nobility would have more power and the merchants less, and the beggining of the explorations would be delayed, since the nobles were not interested in it.

Also, if Castille wins then the Anglo-Portuguese alliance is killed at its beggining. Portugal would probably follow a foreign relation that follows the Castillian one, until the next war between the Trastamaras happens.
 
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How about John of Gaunt? He had a claim through his wife and he was pursuing it... A compromise candidate for the Portuguese throne maybe?
 
How about John of Gaunt? He had a claim through his wife and he was pursuing it... A compromise candidate for the Portuguese throne maybe?

Well, he had a claim to the Castillian throne, not the Portuguese. His daughter Philippa married John I of Portugal in 1387 as a part of the Anglo-Portuguese alliance. So if John is defeated then this marriage is butterflied. Also, a Castillian victory would make John of Gaunt's claim even more weak, since he wouldn't have Portuguese support.
 
Could Juan I pursue a marriage between Trastamara Dynasty and the new King of Portugal (whoever he might be after a Castilian victory) hoping to annex Portugal through a union of Crowns in the future?
 
Could Juan I pursue a marriage between Trastamara Dynasty and the new King of Portugal (whoever he might be after a Castilian victory) hoping to annex Portugal through a union of Crowns in the future?

Well, if there is a Castillian victory then Juan's wife Beatrice is the Queen of Portugal. Your marriage is already done.;)
Actually that would be a nice TL. The three Iberian kingdoms would have kings from the same house (Trastamara) and sons of the same father (Juan I of Castille).
 
Well, if there is a Castillian victory then Juan's wife Beatrice is the Queen of Portugal. Your marriage is already done.;)
Actually that would be a nice TL. The three Iberian kingdoms would have kings from the same house (Trastamara) and sons of the same father (Juan I of Castille).

Unless Juan I opts to support one of Beatrice's uncles as a puppet King...
 
Unless Juan I opts to support one of Beatrice's uncles as a puppet King...

He wouldn't need it if he wins the war. He would probably only do it if Beatrice dies, in order to have an ally in the Portuguese throne, or if the war is much longer, ending in some kind of stalemate that would allow a compromise candidate.
Of course, if Juan wins but still dies in 1390 with no surviving children from Beatrice. Then you have Beatrice as the Portuguese queen and Juan's son Henry become king of Castille. She could not marry the sons of her husband, so who would be available to become king of Portugal?
 
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