1501–1504: Conquest of the Kingdom of Naples

After the clean success at Milan, one might have expected Louis XII to be on an unstoppable roll. Naples would prove otherwise: what began as a shrewd partition between two crowns ended, three years later, in complete military disaster.

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🤝 The Franco-Aragonese Alliance

It all started with an agreement signed on 11 November 1500: the Treaty of Granada, between Louis XII and Ferdinand of Aragon. The idea was simple, almost cynical — share out the kingdom of Naples rather than fight over it. France would take Naples, the Terra di Lavoro and the Abruzzi; Aragon would get Apulia and Calabria. Venice and the pope, for their part, would stay neutral.

Each side had something to gain. Louis XII wanted to complete his Italian domination, already well under way with Milan. Ferdinand pursued a more personal goal: eliminating the Neapolitan branch of his own Aragonese family. And King Frederick I of Naples, weakened, made an easy target for both ambitions combined.

⚔️ The Conquest (1501)

On the ground, it moved fast. Thirty thousand Frenchmen under d’Aubigny, twenty thousand Aragonese under Gonzalo de Córdoba: faced with this two-pronged offensive, Frederick I capitulated without even giving battle. Naples fell as early as July 1501.

What remained was to split the spoils. The French zone covered the north of the kingdom — Naples, Capua; the Aragonese zone, the south — Apulia, Calabria. The line of demarcation followed the river Liri. On paper, it looked clean. On the ground, it was far less so: the border stayed vague, and tensions were not long in coming.

⚔️ The Franco-Aragonese Conflict (1502–1503)

You could see it coming from the start: a poorly defined buffer zone, ambitious commanders on both sides, a mutual distrust that never really faded. Add to that the broader European balance of power weighing in the background, and the alliance was hanging by a thread.

That thread snapped in July 1502, with the first border incidents. In August, the alliance was officially broken. In September, hostilities began in earnest.

⚔️ The Decisive Battles

At Seminara, on 21 April 1503, d’Aubigny’s Frenchmen won a victory — a minor one, but enough to stabilise the front for a while. A week later, at Cerignola, on 28 April, everything turned: facing Gonzalo de Córdoba, the Duke of Nemours suffered a decisive defeat. This battle is often remembered as the first ever won thanks to firearms — a tactical turning point that cost France Apulia.

The finishing blow came at the Garigliano, on 29 December 1503. Fifteen thousand Frenchmen commanded by Louis II de Saluces faced twenty thousand Aragonese under Gonzalo de Córdoba. The defeat was catastrophic — and with it, all of southern Italy now slipped from France’s grasp.

🏃 The French Retreat

What followed was one long withdrawal. Naples was abandoned in January 1504. The retreat north was organised in February. Troops returned to France in March. The toll: ten thousand dead, prisoners taken, equipment lost — a heavy bleeding for the French army.

Two treaties formally sealed this failure. The Treaty of Blois, signed on 22 September 1504, provided for the marriage of Claude de France, born in 1499, to Charles of Habsburg (the future Charles V), born in 1500 — and that of his niece Germaine de Foix to Ferdinand II of Aragon, to whom Louis XII ceded his rights over Naples. This treaty would not survive long: the Estates-General of Tours in 1506 would obtain its annulment and impose instead the marriage of Claude to Francis of Angoulême, the future Francis I.

The Treaty of Lyon, signed on 31 January 1504, settled the rest: France gave up all claims to Naples, Ferdinand recognised in return France’s possession of Milan, prisoners were exchanged, and a three-year peace was agreed.

📊 Analysing the Failure

Militarily, everything worked against France: an opponent, Gonzalo de Córdoba, who proved a formidable tactician; difficult supply lines over distant terrain; a punishing climate, between disease and heat; and French commanders who, it must be said, did not always coordinate their efforts.

Politically, the picture was no more flattering: a fragile alliance from the outset, a local population rather sympathetic to the Aragonese, total diplomatic isolation in southern Italy, and a king whose attention remained fixed on the north, on Milan, more than on Naples. All of which helps explain why a conquest so promising in 1501 ended in fiasco just three years later.

🧠 Key Takeaways

• 1500: Treaty of Granada (partition of Naples)
• 1501: joint Franco-Aragonese conquest
• 1502: breakdown of the alliance
• 1503: battles of Cerignola and the Garigliano (French defeats)
• 1504: Treaty of Blois (marriage of Claude to Charles of Habsburg) and Treaty of Lyon (abandonment of Naples)
• Consequences: end of French ambitions in southern Italy
• Outcome: a costly failure, a loss of prestige

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Next zoom: The Estates-General of Tours and the title of “Father of the People.”