The remains of the Mithraeum of Aosta, also known as the Mitreo di Augusta Praetoria, were discovered in 1953 in insula 59, in a commercial district of the ancient city.
The Gaulish name of today Martigny was either Octodurus or Octodurum in the 1st century BC. It was conquered by the Romans in 57 BC and occupied by Servius Galba with the Legion XII.