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In page Isabella of Aragon, Duchess of Milan:

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Attacked by Louis XII and his allies (Pope Alexander VI and his son Cesare Borgia), betrayed by his cousin King Ferdinand II of Aragon who pretended to be his ally, King Frederick of Naples chose to deal with the French King, and in exchange for some monetary concessions (including the revenues of the County of Maine),[1] he ceded his rights to the Neapolitan throne to Louis XII on 1 August 1501.[citation needed]