The Esposizione Universale Roma (EUR) is a large complex, now a suburban area and business centre, in Rome. Started in 1935, the project to design EUR was commissioned from the leaders of both of the rival factions in Italian architecture: Marcello Piacentini for the "reactionaries" and Giuseppe Pagano for the "progressives". Each of them brought in their own preferred architects to design individual buildings within the complex. The most representative building of the EUR district is Palazzo della Civiltà Italiana (1938-1943), an iconic project which has since become known as the "Colosseo Quadrato" (Square Colosseum).