From Wikipedia:
http://en.wikipedia.org/wiki/Germaine_of_Foix#Marriage_to_Ferdinand_and_Queen_of_Aragon
"Following the death of his wife
Isabella I,
Ferdinand had to yield the government of Castile to his son-in-law
Philip of Habsburg (1478-1506), who assumed power in the name of his wife
Joanna (1479-1555), Isabella's heiress. Ferdinand objected to Philip's policies and to prevent Philip from gaining Aragon through Joanna, he sought to have a male heir with a new wife. A new male heir would displace Joanna (and by extension her husband) from the line of succession. He negotiated with King Louis XII of France for a marriage, hoping perhaps to salve generally bad French-Aragonese relations. At the
Treaty of Blois, Louis agreed to have his niece Germaine of Foix marry Ferdinand...
...Ferdinand and Germaine
did have a son, Juan, Prince of Aragon on May 3, 1509, but he died shortly after birth. Despite the use of love potions, they did not have another. If Juan had lived, then the
Crown of Aragon would have split from the
Crown of Castile once again (after being semi-unified by Ferdinand and Isabella's marriage). This included
Aragon,
Valencia, and
Catalonia in Spain, and the
Kingdom of Naples,
Kingdom of Sicily and
Sardinia in the
Italian peninsula and the
Tyrrhenian Sea. With Juan's death, both Castile and Aragon would eventually go to Ferdinand and Isabella's daughter Joanna."
So, WI Juan had lived and the Kingdom of Aragon had remained separated from Castille? Ferdinand would die in 1516, and Juan would become a seven-years-old king, probably under the regency of his mother Germaine. What could be their policies regarding France and Castille? And how would this independent Aragon influence the Habsburg-Valois conflict?
Sorry if it was already discussed, but I couldn't find the thread.
http://en.wikipedia.org/wiki/Germaine_of_Foix#Marriage_to_Ferdinand_and_Queen_of_Aragon