The Irish god Lugh, we’re told, is one version of a pan-Celtic deity, called Llew in Wales and Lugos/Lugus in Gaul. Given that Lugh was such an important deity, and that Lugos could be the Celtic Mercury that Julius Caesar describes, you would expect Lugos to also be an important and well-attested god.
So it’s a bit of a shock to look up the Gaulish god Lugos/Lugos on the Epigraphik Datenbank and find no inscriptions matching his name. Why is Lugos so often assumed to be the Gaulish Mercury when there’s very little evidence for his worship in France?