The city of Anderitum was built shortly after Caesar conquered Gaul.

In the lower part of Triboulin, a town built in the Roman style is well protected by the sediments at the bottom of the valley. It has a forum, public administration and justice buildings, a performance building and two bathing establishments (thermal baths). Only the temples remain unknown to this day.

The city of Anderitum reached its peak (40ha) in the 2nd century, thanks to the peace and economic dynamics of the Roman Empire. Although it gradually lost its status as capital in the High Middle Ages in favor of Mende, the city remained the capital of the Gabales, "ad Gabalos", until the 7th century.