The Sallustian obelisk, found in the area of the Horti Sallustiani and now in Piazza della Trinità dei Monti, was not part of the spina of the circus, but more likely it adorned a private hippodrome of the villa of Sallust.

Near the street there was an important stately sepulchral area, which included the funerary monument to Sulpicius Maximus, today in the center of Piazza Fiume, and that of Cornelia, currently close to the walls in Corso Italia.

The rione, just like the neighboring Ludovisi and Castro Pretorio, was born at the end of 19th century in an area between Via Pia (what will later become Via XX Settembre) and Via Boncompagni, which until then had been reduced to vineyards and gardens and was part of Trevi.

It differs from the other rioni that developed in the same period for its much less rigid and severe road scheme, with more variations and solutions regarding the shape of the blocks and the conformation of the streets, also due to the small area that it covers.

The rione can be ideally divided into two parts, one among Via Piave, Via Piemonte and Via Antonio Salandra, with a moderate housing density, and the other, up to Via Leonida Bissolati, almost uninhabited and with a high concentration of offices and ministries.