The Kingdom of Trinacria was established after Sicilian Vespers in 1282, when King Peter III of Aragon ascended the throne, and was consolidated after the War of the Sicilian Vespers in 1302.

According to the Peace of Caltabellota, the Kingdom of Sicily was officially divided into two parts, one of which was the island part of Sicily, officially called the Kingdom of Trinacria, but informally called the Kingdom of Sicily.

[1][2] The name "Trinacria" comes from the island's ancient symbol, Triscele.

Meanwhile, the continental part of the Kingdom of Sicily, known colloquially as the Kingdom of Naples, remained under the crown of King Charles II of Anjou.

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