On 26 November 1504, the day Isabella of Castile died, Ferdinand sent Madrid instructions for the succession. The town was to raise its banners for their daughter Joanna, the new queen. The same royal order asserted his own role as administrator and governor under Isabella’s will. Her daughter inherited the crown; her husband intended to keep directing its government. A document announcing a death was also arranging the distribution of power.

Almost nine years later, Niccolò Machiavelli was writing The Prince. Ferdinand would appear by name in its most striking contemporary portrait of a successful monarch. Could the Aragonese king have been the book’s greatest inspiration? There is a substantial case for calling him its foremost model of an established ruler who kept enlarging his authority. That is an interpretation of the evidence, however: Machiavelli never supplied a ranking of his inspirations, and his book cannot be reduced to one royal biography.

The king who made himself indispensable

The clearest evidence comes in chapter XXI, on the conduct that earns a prince esteem. Machiavelli singles out Ferdinand of Aragon, whom he describes as almost a new prince: a hereditary monarch whose achievements had transformed his standing. His subject is the making of political greatness. Ferdinand matters because he has converted a comparatively weak position into exceptional prestige among Christian rulers.

Machiavelli explains the conquest of Granada through that calculation. The war occupied the Castilian nobles, keeping their attention on the campaign while the king increased his authority over them. Money from the Church and the population sustained the army; the prolonged conflict strengthened its military foundations. In this reading, an external enterprise also reorganized relationships inside the kingdom. The nobles helped fight a war that made their ruler harder to challenge.

The argument becomes more unsettling as the chapter proceeds. Machiavelli connects religious language with coercion, dispossession and expansion. Successive undertakings in Africa, Italy and against France keep subjects expectant and absorbed, leaving little interval for opposition to organize. He is describing the political uses of action and belief. His portrait does not establish that every campaign had a single hidden purpose, nor does explaining the effectiveness of persecution make its victims disappear from the historical account.

There is also someone missing from the centre of this portrait: Isabella. Granada and the consolidation of royal government were achievements of a joint monarchy in which the Castilian queen exercised substantial authority. Machiavelli compresses that history around the man whose methods interest him. Antonio Gargano’s study of Ferdinand in Machiavelli and Guicciardini examines the relationship between this political model and the more complicated historical record. He also records a contrary assessment by Miguel Saralegui, who finds Machiavelli’s Ferdinand ambiguous rather than an unqualified model. We should read the portrait as an argument constructed from history, rather than as a complete account of the reign.

Money, allies and the limits of generosity

Ferdinand’s presence extends beyond chapter XXI. In chapter XVI, Machiavelli argues that conspicuous generosity can exhaust a ruler’s resources and force him to burden his subjects. He invokes the reigning king of Spain as someone who could not have accomplished and won so much had he enjoyed a reputation for lavish giving. The discussion concerns generosity with money, not liberalism in its modern political sense. Conserving resources can preserve the freedom to act.

Chapter III supplies another revealing angle. Machiavelli criticizes Louis XII of France for sharing the kingdom of Naples with the Spanish king. By admitting such a powerful partner, Louis gave dissatisfied Italians an alternative protector and introduced someone capable of driving him out. Ferdinand appears here through his rival’s mistake. An agreement that looked like a division of gains could alter the entire balance of power. Diplomacy mattered because it changed who depended on whom.

Was Ferdinand the fox?

Chapter XVIII provides the famous pairing of fox and lion: cunning to recognize traps, force to frighten enemies. Machiavelli discusses broken promises and the distance between a ruler’s public appearance and his conduct. At the end he mentions an unnamed contemporary who constantly preaches peace and fidelity while acting against both. Ferdinand has often been identified as this prince, but the identification is disputed. The passage supports a comparison; it does not contain his name.

The succession of 1504 offers a documented way to examine the distinction between title and effective authority without needing to solve that riddle. Joanna was Isabella’s lawful heir. Ferdinand, already king of Aragon, was not generously giving away a Castilian crown that belonged to him. Isabella’s will provided for his government under specified circumstances. His order to Madrid used that framework to recognize the new queen while asserting his own administrative powers. The text survives in a scholarly edition of the municipal documents by Juan Carlos Galende Díaz.

Yet the arrangement did not keep him continuously in control. Joanna’s husband, Philip, challenged him, supported by important Castilian nobles. Ferdinand withdrew from the government in 1506; Philip died that September, and Ferdinand returned to govern in 1507. His recovery of authority demonstrates political resilience, but the interruption exposes its dependence on allies and circumstances. Joanna’s subsequent confinement at Tordesillas in 1509 also belongs in the account. This was a struggle over the exercise of her sovereignty, with lasting consequences for the queen herself.

The king Machiavelli could criticize

Ferdinand’s success should not turn him into a man who fought only when victory was assured. Machiavelli himself provides the strongest objection. Writing to Francesco Vettori on 29 April 1513, he judges Ferdinand more cunning and fortunate than wise. He criticizes an offensive against France in Italy as an unnecessary risk to all the king’s dominions. The eventual outcome, he insists, does not retrospectively make a hazardous decision prudent.

That letter strengthens the evidence of Ferdinand’s importance while complicating the admiration. Machiavelli was thinking closely about his decisions in the months before composing the treatise. He tested explanations, doubted the assumption that every royal move concealed a brilliant plan, and distinguished political skill from good luck. The king was a major living problem for his analysis. He could be exemplary without being infallible.

Nor was the stability associated with Ferdinand and Isabella an absence of civil conflict. Their Castilian rule had been secured through the succession war of 1475–1479. Vicente Ángel Álvarez Palenzuela’s study shows that the conflict concerned both the crown’s inheritance and the struggle over how royal authority would be exercised. The achievement was to overcome formidable resistance and consolidate government. Describing an uninterrupted domestic peace would erase the process that made that consolidation possible.

Why Borgia still matters

Any argument for Ferdinand’s primacy must reckon with Cesare Borgia. Chapter VII examines how a ruler raised through another person’s arms and fortune might establish independent foundations. Machiavelli gives Borgia’s actions sustained attention, including the attempts to secure his position against future changes. Borgia is fundamental to the book’s examination of acquiring a new state, dependence and political failure. He cannot be dismissed merely because his career ended badly.

The case for Ferdinand rests on a different measure: the breadth and durability of demonstrated power. His example connects resources, military strength, reputation, religious presentation and the management of rivals. That makes him a particularly strong candidate for the book’s most complete contemporary model of successful kingship. Calling him the greatest inspiration is defensible in that defined sense. Calling the entire treatise a disguised portrait of him would go beyond the evidence.

The grandson and the cost of empire

Charles V offers a useful later contrast. María Inés Carzolio’s study of government under Charles describes the resentment provoked by foreign appointments, fiscal demands and the king’s imperial commitments. These tensions helped produce the Castilian revolt of the Comuneros in 1520–1521. The problem recalls Machiavelli’s warning that a ruler’s resources and reputation can be consumed by the demands of his own ambitions. Yet Charles inherited a different combination of territories and obligations, partly created by his grandparents’ dynastic alliances. The comparison requires more than opposing a prudent grandfather to a reckless grandson.

There is also a chronological boundary: The Prince was principally composed in 1513, before that revolt. The Comuneros cannot explain its original conception. They can illuminate, retrospectively, the difficulty at its centre: gaining titles and possessing authority are different achievements. Ferdinand’s order of November 1504 had already exposed that distinction with remarkable clarity. Joanna was to be proclaimed queen, while her father claimed the machinery of government. In that space between acknowledged sovereignty and exercised power lies the strongest argument for reading Ferdinand as one of the decisive figures behind Machiavelli’s prince.

Sources: Machiavelli: The Prince, Italian text, chapters III, VII, XVI, XVIII and XXI; Machiavelli to Francesco Vettori, 29 April 1513; Juan Carlos Galende Díaz: Madrid’s records of Isabella’s death, documentary appendix; Antonio Gargano: Ferdinand in Machiavelli and Guicciardini, pp. 83–104; Giorgio Scichilone: Cesare Borgia in Machiavelli, discussion of the unnamed prince; Real Academia de la Historia: the Catholic Monarchs and the succession; Vicente Ángel Álvarez Palenzuela: the Castilian civil war, 1475–1479; María Inés Carzolio: government under Charles V and the Comuneros; Stanford Encyclopedia of Philosophy: Machiavelli and the composition of The Prince.