The beer is the oldest drink, most common and most widespread in Gaul. The analysis of the ancient texts reveals the frequency of the references to beers through different words and expressions describing the variety of qualities and preparations, the reputation of the beverage and the environment in which it is drinked.

Evidences for malting, the mixing and the breweries of the ninetieth and twentieth centuries as of the medieval sources are used to reconstruct the making, the quantities, times, temperatures, surfaces and structures which will be able to advise our search for ancient remnants whid could have been preserved.

The analysis of several installations and objects which could be linked to the manufacture of beer will be proposed.