How was Isabella able to secure her succession to the Castilian throne in 1469-1479?

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How was Isabella able to secure her succession to the Castilian throne in 1469-1479?

To suggest that Isabella was successful from the outset in securing the Castilian crown and the support of its people would be a foolish interpretation. It took ten years before she was fully accepted as rightful ruler, during which time a number of important factors developed that today can be seen as the clearest reasons for her success. Paramount among these was her determined, intellectual and shrewd personality and character. Without these traits, the other factors would have been irrelevant.

In October 1469, Isabella was married to Ferdinand of Aragon. What is interesting here is the terms of the treaty drawn up after the ceremony that both of them signed. It claimed Isabella to be the rightful and true heir of Castile, that their children were to be educated in Castile and that Ferdinand was to have no power in Castile, just as Isabella was to be impotent in Aragon. However, the clause in the terms that stated that Ferdinand was to supply Isabella with 100,000 gold florins and 4000 troops if necessary is significant. It shows us that from the beginning of their relationship, Isabella was going to have the support of her husband. This idea was to become all the more important during her bid to secure her crown.  An allegiance with the Aragonese, in a military sense would send out a clear message to her rivals. The ultimate option of force, and outside intervention, was a very real alternative if the situation deteriorated.

This building of an inter-relationship between Aragon and Castile was important to Isabella, but it was just as important that Ferdinand’s influence was kept in check, so as to not aggravate the aristocracy who may have considered Ferdinand too powerful in Castile. As a result, Aragonese nobles were restrained from intervening in the Castilian succession saga. In a way, a ‘via media’ grew up between the two states and Ferdinand was able to aid Isabella without patriotic Castilians feeling threatened.

In the early years of Ferdinand and Isabella’s union, the advantages were firmly weighted in favour of Castile. This is no great surprise as, after all, there was no problem with a succession in Aragon. Influences that Ferdinand had over affairs concerning Castilian affairs most concerned the military. He and his troops played a vital role in putting down rebellions in towns and cities. Men were supplied (in line with the terms of the marriage contract) from Castile to help stave off and defeat the Portuguese as well as supporters of Joanna Enriquez, who was Isabella’s main rival to the throne. Because Ferdinand played an important part in halting these problems, the union between Isabella and Ferdinand, and the acquiescence that Ferdinand and Aragon showed them, can be seen to be a significant contributor to Isabella’s eventual victory in 1479.

The fact that Ferdinand’s presence was not too overbearing helped keep grandees happy. They were important members of society. Isabella needed their support and without it she would have struggled to retain popularity and secure her throne. Therefore, before even becoming Queen, it was imperative that she had them on her side, away from Joanna. Originally, only a few grandee families supported Isabella’s cause. It was not until 1470, four years before Isabella became Queen, that opinion switched. An important reason for this change in support by the grandees from Henry IV and Joanna to Isabella was due to the birth of Isabella and Ferdinand’s daughter in October 1470. Now, there was an heir, a natural line of succession. In this, the grandees saw stability and an effortless continuation of power after Isabella, should she become Queen.

Her fortunes were lifted further in the same month by the death of Charles Duke of Berry. Berry had been considered a suitable husband for Joanna, who was still only 9. His death caused a shift in the balance of power. It was no longer in the grandees’ interests to support Joanna’s cause. It had become apparent that transferring support from Joanna to Isabella would not just aid Isabella, but, ultimately, aid themselves. At this stage, many grandees saw Isabella as a good way of getting privileges from the King. When the Pope officially endorsed her marriage to Ferdinand in December 1471, many would have considered her rise to power as inevitable, even graceful. While this perception was not correct, support for her grew steadily.

Isabella had to be shrewd and clever in order to keep the nobility on her side. She promised not to take away land given to noble and grandee families by Henry IV and also agreed to leave Crown land alone. Nobles were guaranteed their lands without endangering the liberties of cities. The cities were protected from powerful nobles who wished to expand their estates.

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Naturally, some influential figures were more interested in how much they could gain from supporting either Joanna or Isabella than in helping the development of the region. Pedro Gonzalez de Mendoza was from a very wealthy and influential clan that owned vast tracts of land and controlled thousands of troops. He had made it clear that he wished to be made Cardinal. As the Pope was pro-Aragonese, Pedro switched to supporting Ferdinand and was duly awarded his position. Convinced of Ferdinand’s influence in helping him, by the end of 1472 the entire Mendoza family switched their support to Isabella. ...

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