Enric Prat de la Riba i Sarrà (Castellterçol, 1870-1917). Politician and lawyer, was president of the Provincial Council of Barcelona (1907-1914) and promoter of the Commonwealth of Catalonia where he was president between 1914 and 1917. As a defender of Catalan nationalism, he was the architect of Catalan political and institutional movement in the early years of the twentieth century. He founded the Institut d'Estudis Catalans (Institute of Catalan Studies). La nacionalitat catalana, written in 1906 is his work of note.
Personal papers in the Arxiu Nacional de Catalunya (National Archive of Catalonia)
Personal library of Prat de la Riba in the Biblioteca de Catalunya