La Bâtie-Montsaléon is a commune in the Hautes-Alpes department in southeastern France. It is notable for being the location of the Battle of Mons Seleucus in 353, when Constantius II defeated the usurper Magnentius.
Wikipedia https://en.wikipedia.org/wiki/La_Bâtie-Montsaléon
Coordinates 44°27'24.502" N 5°45'6.114" E