WI: John of Gaunt and Constance of Castile have a son

What if John of Gaunt and his second wife, Constance of Castile, had a male heir sometime around the 1370's?
Would this heir end up having a claim to the castilian throne? If so, then could he succeed in getting it and estabilishing a lancastrian dynasty in the country, similarly to what his father tried to do IOTL?
 
Being a legitimate grandson of Peter I (named Peter too?) then he'd certainly have a claim to Leon and Castile behind his mother's.
His existence would also make it harder for John of Castile to buy off John of Gaunt and the subsequent marriage of their children.
I suspect the various wars continue and the Lancasters form a lasting alliance with Portugal. If Gaunt is still made Duke of Aquitaine shortly before his death it's possible to get "Peter II" at least governor there and in reach of C&L. If Peter II doesn't get full dominion it's possible he still gets Galicia as the buy off.
 
What if John of Gaunt and his second wife, Constance of Castile, had a male heir sometime around the 1370's?
Would this heir end up having a claim to the castilian throne? If so, then could he succeed in getting it and estabilishing a lancastrian dynasty in the country, similarly to what his father tried to do IOTL?

There WAS a son, born in 1374, named Edward/John (depending which source you consult). Unfortunately, he didn't die in infancy.

As to the likelihood of a Lancaster Castile or a York Portugal, I'm always interested in seeing it. Don't know how feasible it would be though.
 
While I didn't go with a surviving son, I do have a Lancaster Castile in my TL. It is messy, bloody and long conflict but under certain circumstances I don't think that if the Lancasters had put their efforts into it there are certainly possibilities for taking the throne. That said, I did it with a continued Plantagenet dynasty so the Lancasters aren't as caught up in English politics and can focus on Castile. Without England as a possibility for a throne the Lancasters would probably have gone after the Castilian throne much more fiercely. A surviving son could also serve as a spur towards continuing attempts at the throne. John of Gaunt was more focused on taking the Castilian throne than trying for the English one during Richard's regency, the period was just so intensely violent and with riotous uprisings across the region keeping John from really investing his resources in Castile. It is really a question of creating an opening for John to make the attempt at the Castilian throne.
 

Oops. I meant he DID, although I can't find a date of death for him, so I'm guessing he was either stillborn (why do they list them with names then, instead of X/N of Lancaster?) or died soon after birth.
 
Interestingly this Edward/Peter would be of an age to marry/be-betrothed-to Beatrice of Portugal before the Treaty of Salvaterra.
Thus rather than Lancaster Castile one could have a Lancaster Portugal.
 
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