Old Castile

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.

This kingdom had its origins in the 9th century in an area now comprising Cantabria, Álava, and Burgos province.

[citation needed] In the 18th century, Charles III of Spain assigned to Castilla la Vieja the provinces of Burgos, Soria, Segovia, Ávila, Valladolid, and Palencia.

For example, early editions of Enciclopedia Espasa, of the Encyclopædia Britannica and the popular student encyclopedia Álvarez all follow this division of provinces into Castilla la Vieja and the Region of León.