Margaret of Sicily daughter of the King Frederick III of Sicily (1331–1377) Parents Eleanor of Anjou, Queen of Sicily Frederick III of Sicily Children Siblings Elisabeth of Sicily, Duchess of Bavaria William II of Athens Roland of Sicily Sanciolo d'Aragona Constance of Sicily, Queen of Cyprus John, marquess of Randazzo Manfred of Athens Alfonso Fadrique d'Aragona, Count of Malta Peter II of Sicily Isabel de Aragón Partners Rudolf II, Count Palatine of the Rhine