History of Monaco, from a Genoese rock to Albert II's country

Monaco’s history makes more sense as a string of gambles than as a list of rulers. An exiled family grabs a rock by surprise, survives for centuries by switching protectors, loses almost the whole country in a treaty and reinvents itself with a casino. I tell it in order, with the dates given by the Palace, the government and the statistics institute, and the full timeline sits in the table. If you are planning to visit, the starting point is my guide to Monaco.

A rock that Genoa wanted to fortify

Monaco starts out as Genoa’s concern. In 1162 Frederick Barbarossa recognises Genoese rule over the Ligurian coast as far as Monaco, and in 1191 the Emperor grants them the Rock, its harbour and the surrounding land, with permission to fortify it. They buy the ground from the consuls of Peille and the abbey of Saint-Pons and, on 10 June 1215, lay the first stone.

That fortress had four square towers joined by a curtain wall about eight metres high, and its almost triangular outline still traces the edge of the Prince’s Palace today. It is my favourite fact from this century, because when you look at the Palace from the square you are looking, in plan, at the Genoese work of 1215.

How did the Grimaldis end up with Monaco?

In the dead of night on 8 January 1297, François Grimaldi, known as Malizia, from a Guelph family thrown out of Genoa, turns up at the fortress dressed as a Franciscan. His weapons are hidden, and he takes the place from the Ghibellines by cunning. The Grimaldis lost it several times in the years that followed and only held it for good some thirty years later. The first Lord of Monaco was Charles I, in the first half of the fourteenth century.

From there the family adds piece after piece. Charles I also takes Menton and Roquebrune, and in 1458 Lambert Grimaldi foils a conspiracy, secures the loyalty of all three towns and leaves the house its motto, Deo Juvante. In 1997 Monaco celebrated seven hundred years of the dynasty. Who the Grimaldis are today I cover in the Grimaldi family.

Three centuries of changing protectors

What strikes me as cleverest in this story is how such a small lordship survived between great powers. It held out against a Genoese siege in 1506 and 1507, and in 1512 got Louis XII of France to recognise its sovereignty. In 1523 Lucien Grimaldi is murdered, and his brother Augustin, disillusioned with France, turns to Charles V. The Treaty of Burgos is signed on 7 June 1524 and opens more than a century of Spanish protection. The Emperor himself stays in Monaco in August 1529, on his way to his coronation in Bologna.

With the Spanish inside comes the princely title. In 1612 Honoré II adopts it to assert his authority over a Spain that had run Monaco while he was a minor. And in 1641 he changes sides. Under the Treaty of Péronne, signed on 14 September, Monaco passes to French protection, with a French garrison under the prince’s authority, and Honoré II receives the Duchy of Valentinois and the Marquisate of Les Baux, among other titles. The title of Marquis of Les Baux is held today by the hereditary prince, Jacques.

Revolution, Sardinia and the treaty that changed everything

The French Revolution ends the lordship for the first time. French troops cross the border in 1792, and on 14 February 1793 Monaco is joined to France as an ordinary municipality of the Alpes-Maritimes. The Palace is looted, its collections sold off, and the building becomes a military hospital and later a poorhouse. The Treaty of Paris of 1814 restores the Grimaldis’ rights, and in 1815 protection passes to the King of Piedmont-Sardinia, which in practice clips the prince’s wings considerably.

Then comes the hardest blow. In 1848 Menton and Roquebrune declare themselves free towns and Sardinia occupies them. When the County of Nice passes to France in 1860, Charles III negotiates and, on 2 February 1861, gives up both towns in exchange for four million francs and the promise of a road and a railway. Monaco loses 90% of its territory and is left with 145 hectares. In return, according to IMSEE, it regains full and lasting independence. Why that makes it a full country is the subject of is Monaco a country?.

From ruin to roulette, the century that invented Monte-Carlo

With the country shrunk to a rock and a strip of coast, Charles III bet on sea bathing and gambling. The concession was granted in 1856, but the business only took off in 1863, when François Blanc took it on, fresh from his success with the casino at Homburg and later nicknamed the wizard of Monte-Carlo. The terms obliged his company to provide public services, from water and gas to roads and transport links with Nice and Menton. The promised railway arrived in 1868, when the Paris-Lyon-Méditerranée line reached Monaco, as the Palace itself recalls. The Hôtel de Paris had already opened in 1864, and in 1866 the new town on the Spélugues plateau took the prince’s name, Monte-Carlo. Today it is the district of the Monte-Carlo Casino.

The rest of the century keeps up that momentum. The customs agreement with France follows in 1865, the flag in 1881, the first stamps in 1885 and a diocese of its own in 1887. Albert I, who led 28 oceanographic expeditions, founds the Oceanographic Museum in 1910 and grants the first Constitution on 5 January 1911. His son Louis II reigns from 1922, sees the first Grand Prix on 14 April 1929 and spends the Second World War with the country occupied, first by Italy from November 1942 and then by Germany from September 1943.

Rainier III and Albert II, the country you know

Rainier III comes to the throne on 9 May 1949 and reigns for almost 56 years. He was called the builder prince because he enlarged the territory by a fifth, reclaiming land from the sea at Le Portier, Larvotto and, above all, Fontvieille, between 1966 and 1973. His reign brings the wedding to Grace Kelly in 1956, the current Constitution of 1962, the stand-off with de Gaulle’s government, which went as far as imposing border checks, and UN membership on 28 May 1993.

Albert II succeeds him on 6 April 2005. On his watch Monaco has signed its monetary agreement with the EU, seen its heirs born in 2014 and unveiled a whole district on the sea, Mareterra, on 4 December 2024. On 28 March 2026 it also welcomed Leo XIV, the first papal visit of modern times. The previous pope received on the Rock had been Paul III, in 1538.