Martigny (maʁtiɲi; Martinach, ˈmaʁtiːnaːx; Octodurum) is the capital city of the district of Martigny, canton of Valais, Switzerland. It lies at an elevation of , and its population is approximately 20,000 inhabitants (Martignerains or "Octoduriens"). It is a junction of roads joining Italy, France and Switzerland. One road links it over the Great St. Bernard Pass to Aosta (Italy), and the other over the col de la Forclaz to Chamonix (France). In winter, Martigny is known for its numerous nearby Alp ski resorts such as Verbier. Martigny lies at an elevation of , about south-southeast of Montreux. It is on the left foothills of the steep hillsides of the Rhone Valley, at the foot of the Swiss Alps, and is located at the point where the southwestern-flowing Rhone turns ninety degrees northward and heads toward Lake Geneva. The river La Drance flows from the southern Valais Alps (Wallis) through Martigny and joins the Rhone from the left just after Rhone's distinctive, almost rectangular change in direction. Martigny has an area, (as of the 2004/09 survey), of . Of this area, 31.5% is used for agricultural purposes, while 39.8% is forested. Of the rest of the land, 23.3% is settled (buildings or roads) and 5.3% is unproductive land. In 1964 the current municipality was created with the merger of Martigny-Ville and Martigny-Bourg. On 1 January 2021 the former municipality of Charrat merged into the municipality of Martigny. The Gaulish name of the settlement in the 1st century BC was either Octodurus or Octodurum (whence Martigny is sometimes also called Octodure in French), an oppidum or vicus of the Veragri. Octodurus was conquered by the Roman Republic in 57 BC, and occupied by Servius Galba with the twelfth legion and some cavalry in order to protect the strategically important pass of Poeninus (now known as the Great St. Bernard), by which road the mercatores had used to travel at great risk as well as paying great tolls. (B. G. iii. 1.
Giovanni De Cesare, Azin Amini, Stéphanie Joëlle André, Irene Almeida Samora, Pierre Bourqui, Jean-Noël Saugy