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In page Beatrice of Savoy:

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When Charles took over the administration of Provence in 1246, he did not respect Beatrice's rights within the county. She sought the aid of Barral of Baux and the Pope in protecting her rights within the area.[citation needed] The citizens of Marseille, Avignon, and Arles joined this resistance to Capetian control. In 1248, Charles began to seek peace with her so that he could join his brother's crusade. A temporary truce was reached to allow this.[3]