Artaius is a Celtic epithetXavier Delamarre (2003). Dictionnaire de la langue gauloise. Paris: Editions Errance, p.56 applied to the Roman god Mercury during the Romano-Celtic period. It is known from a single inscription from Beaucroissant in the Isère:
MERCVRIO AVG ARTAIO SACR SEX GEMINIVS CVPITVS EX VOTOCorpus Inscriptionum Latinarum XII: 2199. "To the august Mercury Artaius, Sextus Geminius Cupitus (has dedicated this) sacred (stone) in fulfillment of a vow."
In Gaulish, the word artos means ‘bear’, and artaios would have been a derivative (meaning something like ‘ursine’). Miranda Green considers Mercury Artaius to have been a bear-god.Miranda Green (2004). The gods of the Celts. Sparkford, UK: Sutton Publishing, p.174. It is also possible that Artaius is derived from a place name (so that, as an "Artaian Mercury", he would only indirectly have any association with bears). Based on the inscription found at Beaucroissant, Auguste Longnon surmised that the location was once called Artay; there is a similarly named town, Artaix, in Saône-et-Loire.Longnon, Auguste, Les noms de lieu de la France, Paris, 1920, p. 114.
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