Pietro d'Aragona Spanish military personnel (1270–1296) Parents Constance of Sicily Peter III of Aragon Children Afonso Pires de Aragão Siblings Alfonso III of Aragon Yolande of Aragon, Duchess of Calabria Frederick III of Sicily Elizabeth of Aragon James II of Aragon Jaume Pere d'Aragó i Nicolau Teresa de Aragón Sanç d'Aragó Partners Guillelme de Montcada Constança Mendes da Silva