Philip (1255/56 – 1277), of the Capetian House of Anjou, was the second son of King Charles I of Sicily and Countess Beatrice of Provence.
The island at the time was divided into four judgeships, and was the site of several rivalries: between the city-states of Genoa and Pisa, between Guelfs and Ghibellines (the pro-papal and pro-imperial factions in Italian politics, respectively) and between the royal houses of Aragon and Anjou.
[5] Pursuant to the Treaty of Viterbo of 24 May 1267, Charles arranged for Philip to marry Isabel, daughter and heiress of Prince William II of Achaea.
[10] According to the chronicler Giovanni Villani, Philip fell gravely ill while "tightening a crossbow" (tendere uno balestro) and took to the waters at Pozzuoli.
[9] He died, aged 21, between January and March 1277,[11] and his rights in Achaea passed to his father, who duly inherited the principality upon William's death in 1278.