Caesar reports that in Gaul (present-day France), the druids had a an annual council in the center of that region, and that this Council of Gauls was presided over by a sort of chief druid, one who had the most prestige among the many. Major decisions affecting all the tribes were settled at the council.

This meeting was held on Lughnasa (August 1), a festival along with Beltaine listed on the Coligny Calendar. Caesar also claims that the druids of Gaul often received their training in Britain, and gave much honor to the druids there.