The Basque language is entirely unrelated to any current or extinct language, a fact that has historically underscored a separation between Basque and Spanish culture. Basque was spoken before colonization of Spain by the Roman Empire, and it is the only surviving pre-Roman tribal language in Spain.The official language of Spain is Castilian Spanish, and most people in the Basque region speak it fluently. The few who do no are generally older and live in more remote locations.Under Francisco Franco’s regime, from 1939 to 1975, and in earlier times, the Basque language was repressed due to centrist interests.he Basque language is entirely unrelated to any current or extinct language, a fact that has historically underscored a separation between Basque and Spanish culture. Basque was spoken before colonization of Spain by the Roman Empire, and it is the only surviving pre-Roman tribal language in Spain.