continued its existence as a protectorate of France until the French Revolution.
In 1793, Revolutionary forces captured Monaco and it remained under direct French control until 1814, when the Grimaldis returned to the throne. The principality was reestablished that year, only to be designated a protectorate of the Kingdom of Sardinia by the Congress of Vienna in 1815. Monaco remained in this position until 1860 when, by the Treaty of Turin, the Sardinian forces pulled out of the principality and the surrounding county of Nice (as well as Savoy) was ceded to France. Monaco became a French protectorate once again. Prior to this time there was unrest in Menton and Roquebrune where the townspeople had become weary of heavy taxation by the Grimaldis. They declared their independence, hoping for annexation by Sardinia, France protested. The unrest continued until Charles III gave up his claim to the two mainland towns, (some 95% of the principality at the time) which had been ruled by the Grimaldis for over 500 years. These were ceded to France in return for 4,100,000 francs. The transfer and Monaco's sovereignty was recognized by the Franco-Monegasque Treaty of 1861. In 1869, the principality stopped collecting income tax from its residents—an indulgence the Grimaldis could afford to entertain thanks solely to the extraordinary success of the casino. This made Monaco not only a playground for the rich, but a favored place for them to live.
20th century
Until the Monegasque Revolution of 1910 forced the adoption of the 1911 constitution, the princes of Monaco were absolute rulers. The new constitution, however, barely reduced the autocratic rule of the Grimaldis and in any case Albert I soon suspended it. In July 1918, the Franco-Monegasque Treaty was signed, providing for limited French protection over Monaco. The treaty, endorsed in 1919 by the Treaty of Versailles, established that Monegasque international policy would be aligned with
