The Termes tower, located between Plaisance and Riscle, overlooks the rich Adour valley and its tributary Arros, the country of the lower river, the last lines of the slopes of Armagnac and Vic-Bilh, facing the Pyrenees.
The name of Termes d'Armagnac appears for the first time on July 13, 1309 when the Count of Armagnac, Bernard III, instructs Jean d'Armagnac Terms to plant the pal symbolizing the protection of the county in the center of the new bastide town of Plaisance.
Previously, from the eleventh century (the Middle Ages), a large double mound castrale is built east of the current agglomeration, a locality Monterran. The wooden tower adjoins the St. Bartholomew chapel on a second mound. The latter was destroyed during the Revolution and its status as a parish church suggests that there was a primitive village.
If the details are still little known, rare archaeological evidence militate for the age of human occupation on this confluence site since prehistoric times. These remains become more evident throughout the region with the Roman era.
The 36-meter high tower of Termes, at the foot of which is the current village, is one of the most remarkable examples of the architecture of Gascon castles of the late thirteenth century.
