Frederick III the Simple King of Sicily (1342–1377) Parents Elizabeth of Carinthia, Queen of Sicily Peter II of Sicily Children William of Aragon, Count of Malta Maria, Queen of Sicily Eleonora d'Aragona Siblings Constance of Sicily Beatrice of Sicily Euphemia of Sicily Louis, King of Sicily Bianca d'Aragona Eleanor of Sicily Partners Juana d'Aragona Antonia of Balzo Constance of Aragon, Queen of Sicily