Languages of Catalonia
The main cause of Spanish and Catalan social bilingualism in modern Catalonia was large-scale migration from the rest of Spain during the 20th century, as Catalonia started a significant industrialization which demanded an increased workforce from elsewhere. Spanish has historically been spoken among a minority of civil servants born in other regions in Spain and among segments of the wealthiest bourgeoisie. Spanish has also been spoken as a second language by most Catalans, as it has been the only official language over long periods since the eighteenth century.
List of revived languages
The Aranese language, a standardized form of the Pyrenean Gascon variety of the Occitan language spoken in the Aran Valley, in northwestern Catalonia is still spoken. Once considered to be an endangered language, spoken mainly by older people, it is now experiencing a renaissance; it enjoys co-official status with Catalan and Castilian (Spanish) in Catalonia, and since 1984 has been taught in schools.