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Castile is a large historical region in central Spain that was once a powerful kingdom. It matters because it played a central role in Spanish history, including the unification of Spain and the establishment of the Spanish empire.
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Castile or Castille (/kæˈstiːl/; Spanish: Castilla [kasˈtiʎa] ) is a territory of imprecise limits located in Spain. The Encyclopædia Britannica defines it as encompassing Old Castile and New Castile, as they were formally defined in the 1833 territorial division of Spain.
Castile's name is generally thought to mean "land of castles" (castle in Spanish is castillo), in reference to the castles built in the area to consolidate the Christian Reconquest from the Moors.