Old Castile (Spanish: Castilla la Vieja [kasˈtiʎa la ˈβjexa]) is a historic region of Spain, which had different definitions across the centuries. Its extension was formally defined in the 1833 territorial division of Spain as the sum of the following provinces: Santander (now Cantabria), Burgos, Logroño (now La Rioja), Soria, Segovia, Ávila, Valladolid and Palencia. As the rest of regions in that division, Old Castile never had any special administrative agency; only the individual provinces had their own management.
The name Old Castile reflects the fact that this territory corresponds very roughly to the extension of the Kingdom of Castile around the 11th century, before it expanded to the south. This kingdom had its origins in the 9th century in an area now comprising Cantabria, Álava, and Burgos province.
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