In Celtic mythology, the Gallic god Belenos (Latin Belenus) is comparable to the Apollo of the pantheon of Greek mythology. It is sometimes referred to by the theonym of Maponnos, it is the equivalent of the Irish Diancecht. His consort is Belisama, "the very brilliant one".
He is a luminous god, whose name means "resplendent", "bright", his main functions are medicine and the arts. He is honored during the Beltaine festival, which marks a break in the year, the passage from the dark season to the clear, luminous season. During this festival, the Druids performed a ritual of passing cattle between fires, reciting incantations, to protect them from epidemics.
His worship seems to have been important throughout the Celtic world since inscriptions have been found in Cisalpine Gaul, Transalpine Gaul, Illyria and Noricum.