Porta Praetoria

Porta Praetoria is Aosta's best-preserved Roman city gate, with twin flanking towers and three parallel arches.

Why it matters

The gate formed the eastern entrance to Augusta Praetoria and anchored the decumanus maximus, the city's principal east-west street. Its survival makes the Roman grid and defensive circuit legible in the modern city.

What to notice

The gate is built of local puddinga conglomerate and has two projecting towers framing a central court with three arches: a broad opening for carts and narrower openings for pedestrians. Fragments and traces of the marble facing added in the later first century CE remain visible. Medieval reuse left other traces in its structure.

Context and history

Porta Praetoria was built as part of the colony founded in 25 BCE after the defeat of the Salassi. It stood at the eastern end of the decumanus maximus, where roads from the Roman bridge and Arch of Augustus met the city. The gate was adapted in the Middle Ages, including use as a toll point, before twentieth-century restoration removed some later accretions.