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In 1469, Isabella of Castile married Ferdinand II of Aragon, thus uniting almost all the Christian dominions of Spain under one monarchy.
CNN: Sunday,
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In 1508, the League of Cambrai was formed by Pope Julius II, Holy Roman Emperor Maximilian I, Louis XII of France and Ferdinand II of Aragon to attack Venice.
CNN: Tuesday,
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The core of today's Spain first came together as a political entity in 1469 when the marriage of Isabella and Ferdinand united the two houses of Castile and Aragon.
BBC: Eurozone crisis: Catalonia's place in Spain