Old Castile () is a historic region of Spain, which included territory that later corresponded to the provinces of Santander (now Cantabria), Burgos, Logroño (now La Rioja), Soria, Segovia, Ávila, Valladolid, Palencia.
Its origins are in the historic Castile that was formed in the 9th century in the zone now comprised by Cantabria, Álava, and Burgos.
In the 18th century, Charles III of Spain assigned to the so-called kingdom of Castilla la Vieja the provinces of Burgos, Soria, Segovia, Ávila, Valladolid, and Palencia.
The royal decree of 30 November 1833, the reform of Javier de Burgos ...