Lannepax in Gascon Lannapatz, mean "heath peace" where Crassus, Caesar's lieutenant received the submission of Aquitaine to 56 BC. AD
The proximity of English Aquitaine and the crossing of the Roman road Bordeaux-Toulouse led the Counts of Armagnac are to create a new city in 1290. Walls and ditches, the remains of which still exist, are still visible. After the Hundred Years War in 1453, the Bastide is rebuilt, this time the village has many half-timbered houses with their or their "embans".
The community depends successively counts of Armagnac, the kings of Navarre and the King of France from Henry IV.
At the end of the 19th century, Lannepax account 1580 inhabitants. Then the phylloxera crisis has weakened the local economy.
