The Commonwealth of Catalonia (Catalan: Mancomunitat de Catalunya, IPA: [məŋkumuniˈtad də kətəˈluɲə]) was a deliberative assembly made up of the councillors of the four provinces of Catalonia. Promoted in its final stages of gestation by the Regionalist League of Catalonia, it was strongly endorsed by municipal referendum in October 1913.[1]: 8