Ferdinand and Isabella had son born before Joanna, John, but he had died a few years earlier. Joanna was next in line, although Isabella was concerned that despite her extensive education she might not be suited to the task, nor would her husband, Philip the Handsome, Duke of Burgundy and Archduke of the Netherlands. (The illustration is their marriage contract.) Philip was happy to become King of Castile, but his father-in-law took issue with that.
Ferdinand had been named in Isabella's will as potential regent for Castile if ever Joanna were absent from the country or unable to rule, or if she decided she did not want to be queen. Ferdinand, however, wanted more. He minted coins in Castile imprinted with "Ferdinand and Joanna, King and Queen of Castile, León and Aragon." In 1505 he convinced the Castilian Court that Joanna was unable to govern due to infirmities, and they named Ferdinand her guardian and the governor of the kingdom. Joanna's husband took umbrage at this, and so he minted coins imprinted with "Philip and Joanna, King and Queen of Castile, Léon and Archdukes of Austria."
Philip agreed that Ferdinand would be regent of Castile during the times when Philip and his queen traveled to Philip's Netherlands.
Ferdinand, concerned that without another heir he might see Aragon go to Joanna and Philip, decided he needed a second wife who might produce an heir who could inherit both kingdoms. He married the 17-year-old Ursula Germaine of Foix by proxy on 19 October 1505. Ferdinand was 53. They did not meet until 18 March 1506, where (we are told) the marriage was consummated.
This made France and Aragon closer politically, but Castile saw Ferdinand's re-marriage as a betrayal of the beloved Isabella.
Philip died on 25 September 1506, and Ferdinand was named regent, since Joanna was deemed unfit to rule.
Germaine bore a son on 3 May 1509, but he died shortly after.
Ferdinand died on 23 January 1516, leaving Syracuse, Sicily, several towns in Catalonia, and a town in Naples to his widow, and leaving her in the care of his grandson by Joanna and Philip, Archduke Charles of the Netherlands. Charles moved to Castile in 1517, and Germaine moved to Castile from Aragon to be near him. Germaine went with Charles in 1519 to Aragon where he was crowned as Ferdinand's successor.
In the original post on Ferdinand I mentioned that there was some controversy over his father naming him the heir when Ferdinand was only nine years old. Let's get back to that story (and an earlier time; stretching into 16th-century affairs seems strange to me, given the name of this blog), and see what that was about.
