Under the Empire the Rostra had lost its use, and only served occasionally for the emperor to address the people from, or for reading out edicts and proclamations. The western end of the Forum saw many changes after the fire under Commodus, and was rearranged under Septimius Severus, who restored the old edifices, retaining the names of the founders, and erected others (Spartianus, "Severus," xxiii.). In 203 an arch was erected to Severus and his two sons, and a new Rostra was made on the south side of this arch. By cutting away a piece of the slope of the Capitoline Hill, he formed an escarpment 11 feet high, which was faced with a curved brick wall, and cased with Porta Santa marble, in panels 3 feet 1 inch wide. Between each pair of panels there is a space 6½ inches wide, from which a piece of marble jutted out 3½ inches. Only one of these exists. On it there was fixed a bronze beak, probably made in imitation of the old ones, for in that day they had no naval foes from whom to capture ships. If there was one row only, there were eighteen in all; if two rows, thirty-six. This in itself is sufficient to show the ridiculousness of calling this the original Rostra, which had six beaks only. The peculiar marble casing also shows late work. At the north end of this platform was erected the Umbilicus (E), and on the south end was placed the Milliarium Aureum (F). From the level space on the top of this escarpment the orator would speak; whilst at a short distance in his rear was the street Clivus Argentarius, leading from the Via Sacra to the Porta Rutuminia. This Rostra was popularly known as the People's Rostra, because from it they were addressed--"Deinde ad Rostra Populum convocarunt" (Capitolinus, "Maximus et Balbinus," iii.). The narrowness of the level space on the top of this Rostra caused great inconvenience; and as room could not be gained in the rear, it had to be taken in front, encroaching on the Comitium. Forty-three and a half feet in front of the curved wall of Porta Santa a straight wall was built of travertine and tufa, 78 feet long, with side walls from it back to the extreme ends of the Rostra, and this was cased with Carrara white marble, the space between the two walls being filled with earth, thus making a large platform with a square instead of a curved front. The blocks of tufa and marble were tied together by iron clamps, of which fragments remain, of a shape not used in the earlier days, but used now. [Illustration] That the curved wall and the straight wall are not contemporary is shown by the construction, as well as by the fact that the curved wall is faced with coloured marble, which would not have been the case if it had not at one time been open to the Forum. The curved wall is on a line with the Arch of Severus; but the tufa wall comes out 25½ feet beyond the arch, and is not parallel with the curved wall behind it. The tufa and travertine wall is erected on the travertine pavement of the Comitium.