Lugus (Lugh or Lug in Irish)was one of the most popular deities to Celts. Several cities were named after him, Lugdunum (Lyon) in southern France, Lugdunum Batavorum (Leiden) in the Netherland, and Luguvallium (Carlisle) in northern England. Lugus was also worshipped in several sites on the Spanish province of Tarraconensis (including the tribes of Gallaeci, Astures, Cantabri and Celtiberians.

Lugus was the god of light or of the sun, where the Romans identified him with their god Apollo. With skill in many crafts, he was also identified with another Roman god, Mercury (Hermes).