Between 1284 and 1285, the Crusade against the Crown of Aragon was declared by Pope Martin IV against King Peter the Great of Aragon. This crusade was declared based on King Peter's intervention in Sicilian affairs against the papal will. Most of the conflict took place in Catalonia, although the first episode took place in the frontier of Navarre and Aragon. The Almogavars were at the service of King commanded by King Peter or Roger of Lauria.