アルル王国
Charles supported Margaret II, Countess of Flanders and Hainaut, against her eldest son, John, in exchange for Hainaut in 1253. Two years later Louis IX persuaded him to renounce the county, but compensated him by instructing Margaret to pay him 160,000 marks. Charles forced the rebellious Provençal nobles and towns into submission and expanded his suzerainty over a dozen towns and lordships in the Kingdom of Arles. In 1263, after years of negotiations, he accepted the offer of the Holy See to seize the Kingdom of Sicily from the Hohenstaufens. This kingdom included, in addition to the island of Sicily, southern Italy to well north of Naples and was known as the Regno. Pope Urban IV declared a crusade against the incumbent Manfred of Sicily and assisted Charles in raising funds for the military campaign.