Rioni off Rome Monti Trevi Colonna Campo Marzio Ponte Parione Regola Sant'Eustachio Pigna Campitelli Sant'Angelo Ripa Trastevere Borgo Esquilino Ludovisi Sallustiano Castro Pretorio Celio Testaccio Prati San Saba The Roman Regiones The first urban subdivision was established in the 6th century BC. by Servio Tullio. 4 regions were established within the...