Philip III the Bold: Capetian Continuity and Mediterranean Crises (1270–1285) · HIGH MIDDLE AGES
In 1282, a revolt in Sicily against Angevin domination triggered a major crisis: the Sicilian Vespers. For France, it was an indirect but decisive shock, because the Mediterranean space was already structured by the influence of the Angevin house.
Sicily erupted in violence. The crisis drew in neighbouring powers, notably Aragon, and transformed a local revolt into an international war: control of islands, maritime routes, taxation and prestige.
Philip III was drawn into a dynamic in which the papacy and “holy war” became entangled with dynastic rivalry. The conflict prepared the “Aragonese Crusade” and showed that French power was now projecting itself well beyond the kingdom.
The crisis also had a dimension of legitimation: Aragon could be struck with excommunication, and the very idea of “crusade” served to transform a Mediterranean war into a religious and political cause.