Leucetius/Loucetius (Mars Leucetius) is a Celtic god worshipped in Gaul and Britain; he was sometimes accompanied by a consort, Nemetona (whose name derives from the Proto-Celtic *nemeto- or “sacred grove”). He is a healing god and a protector; his association with Mars by the Romans may indicate a martial aspect as well.

Myth
Unknown.

Cult
Leucetius received votive and dedicatory offerings from his worshippers; otherwise little is known of the specifics of his cult.

Etymology
Leucetius’ name may derive from the Proto-Celtic *louk(k)et-, or “light.”

Region
Leucetius was worshipped in the north-east of Gaul, mainly in what is now Germany, although there is also an single inscription to him in Bath, England.

Literary evidence
Unknown.

Archaeological evidence
Bath, England; Strasbourg, France; Altrip, Germany; Grosskrotzenburg, Germany; Klein-Winternheim, Germany; Mainz, Germany; Marienberg, Germany; Ober-Olm, Germany; Wiesbaden-Frauenstein, Germany; Worms, Germany