Okay kiddo, so a long time ago, about 800 years ago, there were these people called the Sicilians who lived on an island called Sicily. They were really mad at some other people called the French who were ruling over them.
One day, in the evening time, the Sicilians decided to have a party called a Vespers. They invited all the French people to come to the party too. But during the party, when it was dark outside, the Sicilians suddenly attacked the French people and kicked them out of their island.
This event is called the Sicilian Vespers and it was a big moment in history because it showed that the Sicilians were strong and could stand up to the French who were very powerful back then. So, it's like a big story of how the Sicilians fought for their freedom from the French rulers.