Castile and Aragon, now being indissolubly united, and internal peace secured, it was time for the sovereigns to prepare for the execution of the great designs that had respectively moved them to effect what they had done. These designs were to some extent divergent from each other. Ferdinand’s main object was to cripple his rival, France, in the direction of Italy, and assume for Aragon the hegemony of the Mediterranean and of the sister Peninsula, of which Sicily already belonged to him and Naples to a member of his house. Castile, on the other hand, had for centuries cultivated usually harmonious relations with France, the frontiers not being conterminous except at one point, the mouth of the Bidasoa; and the ambitions of Castile were traditionally towards the absorption of Portugal, the domination of the coast of North Africa, and the spread of the Christian power generally to the detriment of Islam, its secular enemy. Its own Moorish populations were as yet but imperfectly assimilated, and the existence of the realm of Granada in the Peninsula kept hopes alive in the breasts of the Castilian Moors. The presence of many thousands of potential enemies in the midst of Christian Spain, and the wealth and number of the Jews, who, in a struggle, would probably side with the Moors, undoubtedly influenced greatly in causing the severity of the Inquisition against them and their subsequent expulsion. The first step, therefore, to be taken towards the objects either of Aragon and Castile, was to reduce to impotence any Moorish power in Spain itself that might cause anxiety to the Christian rulers whilst they were busy upon plans abroad, though this step was mainly important to Castile rather than to Aragon.