Navarre , Spanish Navarra, Ancient kingdom, northern Spain, bordered by France, Aragon, Castile, and the Basque Country. It encompassed the modern autonomous community of Navarra and part of the modern French région of Aquitaine. It was conquered by the Romans, then Charlemagne. It became an independent kingdom in the 9th century. A succession of French dynasties ruled Navarre after 1234. Incorporated into Castile in 1515, it was united to the French crown when Henry of Navarre became King Henry IV of France in 1589.
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