There were probably in Gaul many local gods, tribal or otherwise, of
roads and commerce, of the arts, of healing, etc., who, bearing
different names, might easily be identified with each other or with
Roman gods. Cæsar's Mercury, Mars, Minerva, etc., probably include many
local Minervas, Mars, and Mercuries. There may, however, have been a few
great gods common to all Gaul, universally worshipped, besides the
numerous local gods, some of whom may have been adopted from the
aborigines. An examination of the divine names in Holder's
_Altceltischer Sprachschatz_ will show how numerous the local gods of
the continental Celts must have been. Professor Anwyl reckons that 270
gods are mentioned once on inscriptions, 24 twice, 11 thrice, 10 four
times, 3 five times, 2 seven times, 4 fifteen times, 1 nineteen times
(Grannos), and 1 thirty-nine times (Belenos).[55]

The god or gods identified with Mercury were very popular in Gaul, as
Cæsar's words and the witness of place-names derived from the Roman name
of the god show. These had probably supplanted earlier names derived
from those of the corresponding native gods. Many temples of the god
existed, especially in the region of the Allobrogi, and bronze
statuettes of him have been found in abundance. Pliny also describes a
colossal statue designed for the Arverni who had a great temple of the
god on the Puy de Dôme.[56] Mercury was not necessarily the chief god,
and at times, e.g. in war, the native war-gods would be prominent. The
native names of the gods assimilated to Mercury are many in number; in
some cases they are epithets, derived from the names of places where a
local "Mercury" was worshipped, in others they are derived from some
function of the gods.[57] One of these titles is Artaios, perhaps
cognate with Irish _art_, "god," or connected with _artos_, "bear."
Professor Rh[^y]s, however, finds its cognate in Welsh _âr_, "ploughed