1499–1500: Conquest of the Duchy of Milan

Of all Louis XII’s military campaigns, this one remains the cleanest, the fastest, and the one that left the most lasting mark on his image as a conquering king. Let’s look back at a year that turned an entire duchy upside down.

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🏰 Context and Claims

Louis XII invented nothing: his claim to Milan came from his grandmother, Valentina Visconti, the last direct heiress of the Visconti. The problem was that the throne was already occupied — by Ludovico Sforza, known as il Moro, who had hardly gone out of his way to stay on good terms with France. In 1495, he had switched sides at the worst possible moment, betraying the alliance made with Charles VIII. So Louis XII had, on top of a legal claim, a ready-made pretext.

The Italy of the day did nothing to help Ludovico Sforza win friends: fragmented between Milan, Venice, Florence, Naples and the Papal States, it lived on constant rivalries. Louis XII made skilful use of this, allying himself with both Venice and the pope at once. The stated goal: drive out Sforza and take Milan.

⚔️ Military Preparations

Nothing was left to chance. Louis XII gathered 30,000 men, including 10,000 Swiss mercenaries renowned for their battlefield discipline, and 150 cannons — a considerable artillery train for the time. He took command in person. To finance it all: taxes, loans, the sale of offices — the usual tools of a royal treasury put to work.

But the real key to success lay before the first cannon was even fired. The Treaty of Blois, signed in 1499, sealed the alliance with Venice. Pope Alexander VI lent his support. Florence and Naples were neutralised through diplomacy. The result: by the time the French army entered Italy, Ludovico Sforza no longer had a single ally to count on.

🗺️ The Military Campaign

In August 1499, the French army crossed the Alps via the Mont-Cenis pass. And there came a surprise: the advance proved almost too easy. Towns fell without a fight, and the population gave these Frenchmen, who presented themselves as liberators rather than invaders, a rather warm welcome.

Milan itself put up little resistance: a brief siege was enough. Ludovico Sforza, realising the game was up, fled to Germany. On 6 October 1499, Louis XII made a triumphant entry into the city and proclaimed himself Duke of Milan. Barely two months had been needed.

🏰 The French Government in Milan

What remained was to administer this brand-new duchy. Louis XII entrusted the task to Georges d’Amboise, cardinal and the king’s chief minister, who chose a cautious approach: partly retaining local structures, keeping taxation moderate so as not to alienate the population, and setting up mixed Franco-Italian courts rather than imposing a wholly foreign system. Trade and agriculture were developed, urban improvements were made, and the local Church was supported. In short, the aim was to last, not to crush.

⚔️ Ludovico Sforza’s Counter-Attack

But Sforza had not said his last word. In February 1500, he returned at the head of 20,000 Swiss mercenaries, backed by Maximilian of Austria, and retook several towns. For a time, Milan itself was under threat.

The French response came quickly. In April 1500, at Novara, 15,000 French troops commanded by Louis de La Trémoille faced Sforza’s 20,000 men. And it was a clear victory: Ludovico Sforza was captured. If proof were needed, this episode confirmed that the first conquest had been no isolated stroke of luck.

🏆 Assessing the Conquest

In two months, Milan had been taken; within a few more weeks, Sforza’s counter-offensive had been swept aside. The French administration, reasonably well accepted, gave Louis XII a solid strategic base in northern Italy and lasting recognition as Duke of Milan.

Not everything was rosy, however: the campaign had come at great cost, the Milanese nobility remained uncooperative, Venice and the Empire watched it all with unease, and supplying the troops on such distant ground posed constant logistical problems. But for the opening act of Louis XII’s great Italian project, the balance sheet remained largely in his favour.

🧠 Key Takeaways

• 1499: conquest of the Duchy of Milan
• Claim: descent from Valentina Visconti
• Victory: capture of Milan in October 1499
• Government: moderate French administration
• Counter-attack: defeat of Ludovico Sforza at Novara (1500)
• Consequences: consolidation of the French presence in Italy

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Next zoom: The conquest of the Kingdom of Naples.