It was on this day in 1793 that the communes of Monaco, Menton and Roquebrune declared themselves a republic having previously declared themselves "free towns" in 1792. Only the previous week the revolutionary clubs had deposed HSH Prince Honore III (who was in France desperately trying to save his estates there from the revolutionary crowd). They were, obviously, following the example of the gang in power in Paris which was working feverishly to tear down the Bourbon monarchy and the Kingdom of France. However, if the new "Republic of Monaco" thought they were going to be close allies and best buddies with the new France (as the Principality of Monaco and the Kingdom of France had been) they were sorely mistaken. Even at the time observers noted how comical the whole act seemed to be.
Three deputies from the Republic of Monaco came to the National Assembly in France to seek the confirmation of the Franco-Monegasque alliance with them. The two articles in the new treaty stated, "There shall be peace and alliance between the French Republic and the Republic of Monaco" and, "The French Republic is delighted to make the acquaintance of the Republic of Monaco". That sounds all nice and friendly but, as Louis XVI or Honore III could have told them, the revolutionary regime was not exactly noted for honesty and fair-dealing. If Monaco thought that by following their republican example they could continue on as they had before only with their own political clique holding power rather than the House of Grimaldi they were very much mistaken. It would not be long (less than a month) before the French Republic decided to annex the whole of Monaco (Menton and Roquebrune included at that time) and the former principality became simply a forgotten little corner of the French Republic, renamed Fort Hercules just so there would be no lingering memories of the past Grimaldi glories of the Principality of Monaco.
Thankfully, although it would take time, this situation was not to be permanent. Like their Bourbon friends the Grimaldis were finally restored to their throne, though unlike the Bourbons they have managed to remain ever since with absolutely no nostalgia for the republican era when independence was lost.