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The Arch of Augustus (in French Arc d'Auguste) is a monument in the city of Aosta, northern Italy.It was erected in 25 BC on the occasion of the Roman victory over the Salassi and was the work of Aulus Terentius Varro Murena.It is located at the end of the decumanus maximus, a little distance from the Bourg Saint-Ours (quarter of the Collegiate Church of Saint Ursus) and from the eastern entrance of the city wall (the Porta Prætoria).

Sant'Orso, or Saint-Ours, is a collegiate church in Aosta, northern Italy, dedicated to Saint Ursus of Aosta. The original church had a single hall, delimited by a semicircular apse. It was entirely rebuilt during the 9th century, during the Carolingian age. Later, bishop Anselm of Aosta further renovated the church, introducing a basilica plan with three naves with wooden trusses.