Ferdinand II of Aragon and Isabella I of Castile

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By the irony, or perhaps the eternal justice of fate, all the chicanery of Ferdinand, all the wisdom, the labours, and the fervour of Isabella brought disaster, ruin, and death to Spain. A thousand times happier would it have been for Castile to have remained isolated in its corner of Europe, untroubled with the complications of vast European connections, rather than to have been dragged by Aragon into a position of responsibility and world-wide ambition for which neither its native resources nor the extent nor character of its population befitted it.
Source: Gutenberg

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But the same people who had said "Isabella shall be the heir-apparent," said now "Isabella shall rule over us," and conquered. The reign of Isabella, therefore, dates from 1479, when she was left in undisputed possession of her throne, rather than from 1474, when she wore her crown for the first time in Segovia. The same year that brought peace to the Queen of Castile elevated Ferdinand to the throne of Aragon.
No more important epoch marks the history of Spain than the union of the crowns of Castile and Aragon; it meant the end of petty principalities and powers, it meant united Spain.
Source: Gutenberg

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To carry one realm too far forward before going back to bring forward the other is destructive of a sense of synchronology, while the attempt to carry them simultaneously is as bewildering as it is difficult.
To carry Castile forward to that well-known time when Isabella wed Ferdinand of Aragon is to be compelled to retrace our steps for three centuries. It seems most convenient to do as follows: Leaving Castile at the moment of the death of that easily remembered monarch Pedro the Cruel, to take up Aragon and bring its history to the same point.
Source: Gutenberg

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