Porta romana or Arco di Monterone. At the beginning of the descent down via Monterone. It was built out of huge blocks of squared stone in the third century B.C. and is still partially buried. It constituted the southern entrance to and the very beginning of the city. It is the oldest gate and, indeed, the only one which has survived whole of the four main gates which were opened in the Roman walls. The principal roads leading to the surrounding territory left from these gates: Porta Fuga (from which the via Flaminia left for Foligno and Fano) was re-built in 1200; of Porta Ponzianina (from which the via Nursina left for Norcia) only the restored threshold remains; Porta San Lorenzo, in what is now Borgo San Matteo, (from which the via Romana began on its way to Carsulae and Terni) now practically no longer exists.