In Gallo-Roman religion, Loucetios (Latinized as Leucetius) was a Gallic god known from the Rhine-Moselle region, where he was identified with the Roman Mars. Scholars have interpreted his name to mean âÂÂlightningâÂÂ. Mars Loucetius was worshipped alongside the goddess Nemetona.
The name Loucetios derives from a Celtic stem *lowk-et-, meaning 'flash of lightning, thunderbolt' (cf. Old Irich lóchet), itself from the root *lowk- ('bright, light'; cf. Middle Irish luach 'glowing light', Middle Welsh llug 'eyesight, perception'). It is the source of the place name Luzech, attested as Luzechium in 1326 CE.
The name may be a reference to either a Celtic common metaphor for battles as thunderstorms (cf. Old Irish torannchless, the 'thunder feat'), or else the divine aura of the hero (the lúan of Cú Chulainn). It is presumably analogous to Oscan Loucetius âÂÂlight-bringerâÂÂ, an epithet of Jupiter.
About a dozen inscriptions in honour of Mars Loucetius have been recovered, mainly from eastern Gaul, with a particular concentration among the Vangiones and Aresaces (two Rhenish tribes). Inscriptions to him have also been found at Bath and Angers; the altar at Bath specifies that it was dedicated by a citizen of the Treveri.
Inscriptions often invoke Mars Loucetius together with Victoria or Nemetona (or both, in the case of the Eisenberg inscription). Edith Mary Wightman considers this pair âÂÂclosely similar to if not identical with, Lenus and AncamnaâÂÂ, who are known chiefly from the territory of the Treveri adjacent to those of the Aresaces and Vangiones.
Four of the inscriptions to Mars Loucetius are also dedicated IN H(onorem) D(omà «s) D(ivinae), âÂÂin honour of the divine houseâ (i.e. the imperial family).
Wightman further suggests that the shrine of Mars Loucetius at Klein-Winternheim, south of Mainz, was âÂÂa central one for the AresacesâÂÂ, the ancient inhabitants of the Mainz-Bingen area.
In Neil Gaiman's American Gods, Leucotios appears in chapter three, during Shadow's (the main character) dream of forgotten gods. Gaiman's Leucotios is described as a âÂÂman with ... white hair, with a necklace of teeth about his neck, holding a drumâÂÂ.