The marriage of royal cousins Ferdinand II …

Years: 1396 - 1539

The marriage of royal cousins Ferdinand II of Aragon (1452-1516) and Isabella of Castile (1451-1504) in 1469 eventually brings stability to both kingdoms.

Isabella's niece, Juana, bloodily disputes her succession to the throne in a conflict in which the rival claimants are given assistance by outside powers—Isabella by Aragon and Juana by her suitor, the king of Portugal.

The Treaty of Alcacovas ends the war in September 1479, and as Ferdinand has succeeded his father in Aragon earlier in the same year, it is possible to link Castile with Aragon.

Both Isabella and Ferdinand understand the importance of unity; together they effect institutional reform in Castile and leave Spain one of the best administered countries in Europe.

Even with the personal union of the Castilian and the Aragonese crowns, Castile, Aragon, Catalonia, and Valencia remained constitutionally distinct political entities, and they retain separate councils of state and parliaments.

Ferdinand, who had received his political education in federalist Aragon, brings a new emphasis on constitutionalism and a respect for local fueros to Castile, where he is king consort (1479-1504) and continues as regent after Isabella's death in 1504.

Greatly admired by Italian political theorist Niccolo Machiavelli (1469-1527), Ferdinand is one of the most skillful diplomats in an age of great diplomats, and he assigns to Castile its predominant role in the dual monarchy.

Ferdinand and Isabella resume the Reconquest, dormant for more than two hundred years, and in 1492 they capture Granada, earning for themselves the title of Catholic Kings.

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