Porta Collina in the context of Servian Wall

The Ponte Salario, also called Ponte Salaro during the Middle Ages, is a road bridge in Rome, Italy, whose origins date back to the Roman period. In antiquity, it lay outside the city limits, 3 km north of the Porta Collina, at the point where the Via Salaria (modern SS4) crossed the Aniene, a tributary of the Tiber. The visible side arches are assumed to originate from the first stone structure built during the 1st century BC.

In the Gothic War (535–554), the main arch was largely destroyed by the Ostrogothic king Totila, but repaired by his East Roman opponent Narses in 565, who recorded the extensive restoration works, including a river diversion, in an extant bridge inscription. At that time, the Ponte Salario was 72 m long and 6.52 m wide, with its semi-circular arch reaching a remarkable clear span of 24.86 m.

The Battle of the Colline Gate, fought on 1 November 82 BC, was the decisive battle of the civil war between Lucius Cornelius Sulla and the Marians, Samnites and Lucanians. Sulla won the battle at the northeastern end of Rome, near the Colline Gate, and secured control of Italy. Appian is the only source who provides details about the battle.

The next day Sulla ordered the slaughter of the Marian leaders and Samnite prisoners in the Villa Publica. On 3 November, he started the proscription of his enemies.

The Via Nomentana was an ancient Roman road in Italy, leading North-East from Rome to Nomentum (modern Mentana), a distance of 23 km (14 mi). It originally bore the name "Via Ficulensis", from the old Latin village of Ficulea, about 13 km (8.1 mi) from Rome. It was subsequently extended to Nomentum, but never became an important high road, and merged in the Via Salaria a few kilometers beyond Nomentum. It is followed as far as Nomentum by the modern state road, but some traces of its pavement still exist.

The road started at the Porta Collina in the Servian Walls until the third century, when emperor Aurelian built the Porta Nomentana in his new set of walls.

The Alta Semita ("High Path") was a street in ancient Rome that gave its name to one of the 14 regions of Augustan Rome.

The Alta Semita brought traffic into Rome from the salt route (Via Salaria) that had existed since prehistoric times. The great antiquity of the street is also suggested by semita, a Latin word usually meaning "footpath" and not used for any other Roman street. It ran most likely along the modern Via del Quirinale and Via Venti Settembre, on the spine of the Quirinal Hill, creating a straight route southwest from the Porta Collina in the Servian Wall to a major temple from the Hadrianic era on the Collis Salutaris. It probably connected to the Vicus Iugarius.