The colonnade was not uniform in character upon all the three sides. As will be seen from our plan ([Plan II]), on the south side, and on the adjoining portion of the east side as far as Abbondanza Street, it was constructed with two rows of columns and had a double depth. On the east side, north of this street, the porticos in front of four successive buildings (K, L, M, N) took its place. For the greater part of its extent the colonnade was built in two stories, the lower of the Doric, the upper of the Ionic order. The upper gallery was made accessible by three stairways, at the southeast and southwest corners of the Forum and at the middle of the west side; on the east side it did not extend beyond Abbondanza Street.

The portico in front of the first of the four buildings referred to, that of Eumachia, contained a double series of columns, one above the other, corresponding in style and dimensions with those of the colonnade; but there was no upper floor running back from the intervening entablature. The arrangement in front of the fourth building, the Macellum, was similar; as the remains of the porticos in front of the two intervening buildings have wholly disappeared, it is impossible to determine their character.

The area of the Forum was paved with rectangular flags of whitish limestone. In front of the colonnade, the pavement of which was about twenty inches above that of the open space, a broad step or ledge projected, covering a gutter for rain water; the water found its way into the gutter through semicircular openings in the outer edge of the step.

Of the many statues that once adorned the Forum not one has been found. As may be seen from the pedestals still in place, they were of three kinds, and varied greatly in size.

First, statues of citizens who had rendered distinguished services were placed in front of the colonnade on the ledge over the gutter. Four pedestals that once supported statues of this sort may be seen on the west side.

Then equestrian statues of life size were set up in front of the ledge, these also in honor of dignitaries of the city ([Fig. 17]). On one of the pedestals the veneering of colored marble is still preserved, with an inscription showing that the person represented was Quintus Sallustius, "Duumvir, Quinquennial Duumvir, Patron of the Colony."

Finally, on the south side, the life size equestrian statues, which seem at the outset to have been arranged symmetrically, were almost all removed in order to make room for four much larger statues, the pedestals of which still remain ([Fig. 53], p. 122). These must have represented emperors, or members of the imperial families. The pedestal in the middle, which is in the form of an arch almost square at the base, is much the oldest. Upon it was probably placed a colossal statue of Augustus. It is incredible that during the long and successful reign of the first emperor no statue in his honor should have been erected in Pompeii; and this is the most suitable place. The other three pedestals are similar in construction, and clearly belong together. The one at the right (2 on the plan) supported a colossal equestrian statue; that at the left (3) a colossal standing figure; on the third, further forward (4), was a smaller equestrian statue. Here stood, then, emperor, empress, and crown prince—Claudius, Agrippina, Nero.

A fifth pedestal, for an equestrian statue of the same size as that of Nero, is seen further to the north, in front of the temple of Jupiter (5). While unquestionably later than the time of Augustus, it must on the other hand be older than the pedestals of members of the Claudian family; for aside from himself, no one belonging to Nero's time can be taken into consideration, and after his death the Forum lay in ruins in consequence of the earthquake of the year 63. Who stood here, however, can scarcely be even conjectured. Not necessarily an emperor; the younger Drusus, for instance, Tiberius's son, or Germanicus might have been thus honored if they had in any way come into relation with the Pompeians. But if an emperor, it must have been Caligula; another place was provided for the statue of Tiberius.

In the south side of the arch at the northeast corner of the Forum are two niches. It is highly probable that statues of the two oldest sons of Germanicus, Nero and Drusus, were placed in them; a fragment of an inscription referring to the former was found near by. These became presumptive heirs to the throne after the death of Tiberius's son Drusus, in 23 A.D.; but both afterwards fell victims to the morbid suspicions of the emperor and the plots of Sejanus, Nero in 29 A.D., Drusus four years later.

On the top of the arch an equestrian statue of Tiberius probably stood. That such a statue was placed here seems clear from analogy. North of this arch was another, almost in line with it, at the end of Mercury Street where it opens into Nola Street; and here the excavators found fragments of a bronze equestrian statue which were put together and set up in the Naples Museum. Whether this statue represented Caligula or Nero has been a matter of dispute, but the former is really excluded from consideration by the short, heavy figure, which is better suited to Nero. There is no decided resemblance to Nero either; but it is quite possible that, although as crown prince he had been honored with a statue in the Forum, the Pompeians thought it best to erect for him as emperor a more imposing monument.