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.
Aranese dialect
Aranese () is a standardized form of the Pyrenean Gascon variety of the Occitan language spoken in the Val d'Aran, in northwestern Catalonia close to the Spanish border with France, where it is one of the three official languages beside Catalan and Spanish. In 2010, it was named the third official language of the whole of Catalonia by the Parliament of Catalonia.