Battle of Aquae Sextiae
101 BCE.
Shown on the map at 43.531°, 5.454°.
The Battle of Aquae Sextiae (Aix-en-Provence) took place in 102 BC. After a series of Roman defeats at the Battle of Noreia, the Battle of Burdigala, and most notably at the Battle of Arausio, the Romans under Gaius Marius finally defeated the Teutons and Ambrones as they attempted to advance through the Alps into Italy. Local lore associates the name of the mountain, Mont St. Victoire, with the Roman victory at the battle of Aquae Sextiae, but Frédéric Mistral and other scholars have debunked this theory.
Text from the Wikipedia article Battle of Aquae Sextiae, licensed CC BY-SA 4.0.