A Mixed Assembly formed out of provincial deputies and national members of parliament began the task of drawing up an Autonomy Statute on 10 September 1979. Following the approval of the General Courts on 15 December 1981, the King of Spain signed the corresponding Organic Law of Autonomy Statute for Cantabria on December 30 of the same year. Thus, the province of Santander broke its link to Castile, and left the former region of Castile and León to which it had belonged up to that time, together with the provinces of Ávila, Burgos, León, Logroño, Palencia, Salamanca, Segovia, Soria, Valladolid and Zamora.