Lenus was a Celtic healing god worshipped mainly in eastern Gaul, where he was almost always identified with the Roman god Mars. He was an important god of the Treveri tribe, who had large sanctuaries at medicinal springs at Trier and the Martberg by Pommern in what is now Germany. Two dedications to him are also known from southwestern Britain (Chedworth and Caerwent). Edith Wightman characterizes him as “one of the best examples of a Teutates, or god of the people, equated with Mars—protector of the tribe in battle, but also [...] bestower of health and general good fortune” (p. 211). His sanctuary ‘Am Irminenwingert’ at Trier had a large temple, baths, smaller shrines and a theatre; that on the Martberg also included a large variety of buildings, probably including rooms for health-seeking pilgrims to stay. Despite his associations with healing, Lenus Mars is depicted classically as a warrior with Corinthian helmet in a bronze statuette from the Martberg.
His name most often appears in inscriptions as ‘Lenus Mars’, rather than ‘Mars Lenus’ as would be expected from other most syncretized names. At Trier, Lenus Mars's divine partners were the Celtic god Ancamna and the Roman Victoria, as well as the Xulsigiae, who are perhaps water nymphs. An inscription from Kaul in Luxembourg appears to invoke Lenus Mars ‘Veraudunus’ along with the Celtic god Inciona.
Lenus was not the only Celtic god identified with Mars by the Treveri; others, such as Iovantucarus (apparently a protector of youth), Intarabus, Camulos, and Loucetios were identified with Mars and perhaps, by extension, with Lenus. His name occasionally appears as ‘Mars Laenus’; the more usual form ‘Lenus Mars’ is accompanied by the epithets Arterancus and Exsobinus on one inscription each.
- DEO MARTI LENO SIVE OCELO VELLAVN ET NVM AVG M NONIVS ROMANVS OB IMMVNITAT COLLEGNI D D S D GLABRIONE ET HOMVLO COS X K SEPT
- To the god Mars Lenus or Ocelus Vellaunus and to the Numen of the Augustus, M. Monius Romanus dedicated this from the privilege of the college during the consulship of Glabrio and Homulus ten days before the Calends of September.
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- Edith Mary Wightman (1970). Roman Trier and the Treveri. Rupert Hart-Davis, London.
- L'Arbre Celtique
- Musée d'histoire et d'art, Luxembourg. 1974. Pierres sculptées et inscriptions de l'époque romaine, catalogued by Eugénie Wilhelm, p.71.
- Nicole Jufer & Thierry Luginbühl (2001). Les dieux gaulois : répertoire des noms de divinités celtiques connus par l'épigraphie, les textes antiques et la toponymie. Paris: Editions Errance. ISBN 2-87772-200-7.
- B. Collingwood and R.P. Wright. The Roman Inscriptions of Britain. Oxford. RIB 309. Quoted at Roman-Britain.org.