+The Crown of Castile was a powerful medieval European state, formed from the union of the [Kingdom of Castile](/wiki/kingdom_of_castile) and the [Kingdom of Leon](/wiki/kingdom_of_leon). It played a central role in the Reconquista and laid much of the groundwork for modern Spain.
+## See also
+- [Reconquista](/wiki/reconquista)
+- [Spain](/wiki/spain)
+- [Catholic Monarchs](/wiki/catholic_monarchs)
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