The tutelary deity of the healing sanctuary at Lydney, Gloucestershire, although by no means solely confined to that site.

Nodens was the Romano-Celtic version of Nudd and a god with definite connections to both healing and water, his totem animal appearing to have been the dog. The Romans sometimes equated him with their own god Neptune, a connection that led Nodens to be regarded, by some, as a sea deity.

His name is likely to be derivative of his Irish counterpart Nuadha Airgedlámh, while his Welsh equivalent appears to have been Lludd Law Ereint, or perhaps Nudd, from whom his name might also have been derived.