 The Kingdom of Sicily was to be a tenaciously-pursued inheritance for the Aragonese royal house and its heirs for the next five centuries.Peter was dealing with domestic unrest at the time when the French were preparing an invasion of Aragon.He took Albarracín from the rebellious noble Juan Núñez de Lara, he renewed the alliance with Sancho IV of Castile, and he attacked Tudela in an attempt to prevent Philip I of Navarre from invading on that front.