But the most conspicuous of the ancient remains in this quarter, and the first to attract the notice of every visitor, is the Ionic portico of eight columns, called at first the Temple of Jupiter, and then of Vespasian, but now definitely determined to be the Temple of Saturn, for it is closely connected with the AErarium, and the AErarium is said by several ancient authors to have led into the podium of the temple by a doorway in its wall still visible. This temple is supposed to be of very early origin, and to have marked the site of an ancient Sabine altar to the oldest of the gods of Italy long before the arrival of the Romans. It was nearly entire so late as the fifteenth century; but its cella was ruthlessly destroyed shortly afterwards, and its marble ornaments used for making lime. The present group of pillars was so clumsily restored by the French at the beginning of this century that they are seen to differ from each other in diameter, and the frieze is composed of fragments that do not harmonise. But the most remarkable monument of antiquity in this part is the marble triumphal Arch of Septimius Severus, which stands in front of the ruins of the Temple of Concord. It invaded the site of the republican Graecostasis, where foreign ambassadors waited for an audience of the senate, and occupied part of the area of the Comitium, whose original character was thereby destroyed; for it was erected at a time when men ceased to care for the venerable associations connected with the early history of their city. One gazes upon this monument of Roman power and pride with deep respect, for it has stood nearly seventeen centuries; and though rusty and sorely battered, and its sculptures much mutilated, it is still one of the most solid and perfect relics of imperial times. It was raised to commemorate the wars of Septimius Severus in Parthia and Arabia; and represents among its carvings the goddess Rome receiving the homage of the Eastern nations. It exhibits on its panels many scenes connected with his campaigns, the memory of which no humane man would have liked to perpetuate. On the upper part of the Arch is a large inscription in honour of the emperor and his two sons, Caracalla and Geta. The name of Geta, however, was afterwards erased by his brother when he had murdered him, and other words substituted. Marks of the erasure may still be seen perfectly distinct after all these centuries, and vividly recall the terrible associations of the incident. The dislike which Caracalla and Geta had for each other was so virulent that their father took them both with him to Britain, in order that they might forget their mutual animosity while engaged in active warfare. Septimius Severus died during this campaign at York, and his sons returned to Rome to work out soon after the domestic tragedy of which this Arch reminds us. On the top of the Arch there was originally a bronze group of a chariot and four horses, with the emperor and his sons driving it.