The many sons of Isabella and Ferdinand

Just an idea I had: WI instead of having several daughters to marry with other nobles of Europe (eventually leading to Spain be inherited by a foreign dynasty) the Catholic Monarchs had instead a lot of sons? Let's assume that their issue would be something like this: John (born in 1470), Juana (1478), Ferdinand (1479), Henry (1482) and Alfonso (1485).
Obviously, Spain would remain under the Trastamaras. But what could be the effect of this change in the kingdoms where the OTL princesses were married: Portugal, England and the Habsburg Empire? Any ideas?
 
Juana gets shipped to Portugal and is married there, since securing peace with it was the most prioritary. Plus, there is the old dream of the Iberian union. For the sons I can't say at the moment, but I would expect one of the youngest to become a cleric (Archbishop of Toledo, Santiago or something like that).

Ferdinand might still be interested in making ties with England, Austria and Burgundy to keep France on check but it has suddenly gotten more complicated than IOTL.

I seem to recall something about Philip the Fair considering a marriage with a Danish princess before ending with OTL Juana too.
 
Juana gets shipped to Portugal and is married there, since securing peace with it was the most prioritary. Plus, there is the old dream of the Iberian union. For the sons I can't say at the moment, but I would expect one of the youngest to become a cleric (Archbishop of Toledo, Santiago or something like that).

Ferdinand might still be interested in making ties with England, Austria and Burgundy to keep France on check but it has suddenly gotten more complicated than IOTL.

I seem to recall something about Philip the Fair considering a marriage with a Danish princess before ending with OTL Juana too.

Maybe ITTL with an older "Juan Prince of Asturias" Ferdinand and Isabella could be more successful in forcing Catherine of Navarre to marry their son and so achieve the union without a war of conquest.

The Duke of Brittany also planned a marriage between his daughter and heir Anne to Juan of Asturias IOTL. Now with more spare sons maybe the Spanish monarchs would accept such deal. "Ferdinand" would be almost the same age as Anne.
 
I wonder who Arthur/Henry VIII would end up marrying then.

I'd say either a French princess or someone of Plantagenet blood. Henry VII would be looking to obtain some advantageous marriage that would help establish his dynasty, not a random royal princess from Scandinavia or Germany (methinks).
 
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