By the 9th century, the Catalan language had developed from Vulgar Latin on both sides of the eastern end of the Pyrenees mountains and valleys (counties of Rosselló, Empúries, Besalú, Cerdanya, Urgell, Pallars and Ribagorça), as well as the territories of the Roman province and later archdiocese of Tarraconensis to the south.
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