It is remarkable that so many of the monuments still preserved comparatively intact should have been set up by the adoptive line of the so-called Antonines, from Trajan to Marcus Aurelius, and that the two monster columns, the one in Piazza Colonna and the one in Trajan's Forum, should be the work of the last and the first of those emperors, respectively. Among other memorials of them are the Colosseum, the Arch of Titus and the statue mentioned above. The lofty Septizonium is levelled to the ground, the Palaces of the Cæsars are a mountain of ruins, the triumphal arches of Marcus Aurelius and of Domitian have disappeared with those of Gratian, of Valens, of Arcadius and of many others; but the two gigantic columns still stand erect with their sculptured tales of victory and triumph almost unbroken, surmounted by the statues of Saint Peter and Saint Paul, whose memory was sacred to all Christians long before the monuments were erected, and to whom, respectively, they have been dedicated by a later age. There may have been a connection, too, in the minds of the people, between the 'Column of Piazza Colonna' and the Column of the Colonna family, since a great part of this Region had fallen under the domination of the noble house, and was held by them with a chain of towers and fortifications; but the pillar which is the device of the Region terminates in the statue of the Apostle Peter, whereas the one which figures in the shield of Colonna is crowned with a royal crown, in memory of the coronation of Lewis the Bavarian by Sciarra, who himself generally lived in a palace facing the small square which bears his name, and which is only a widening of the Corso just north of San Marcello, the scene of Jacopo Colonna's brave protest against his kinsman's mistaken imperialism.