Constance of Aragon, Queen of Sicily Aragonese infanta (1340–1363) Parents Maria of Navarre Peter IV of Aragon Children Maria, Queen of Sicily Siblings Joanna of Aragon, Countess of Ampurias Eleanor of Aragon, Queen of Castile John I of Aragon Isabella of Aragon Martin of Aragon Peter of Aragon Alphonse d'Aragon Partners Frederick III the Simple