In ancient Celtic religion

Celtic polytheism

Celtic polytheism, commonly known as Celtic paganism, refers to the religious beliefs and practices adhered to by the Iron Age peoples of Western Europe now known as the Celts, roughly between 500 BCE and 500 CE, spanning the La Tène period and the Roman era, and in the case of the Insular Celts...

, Ialonus Contrebis or Ialonus or Gontrebis was a god (or perhaps two related gods) worshipped in what are now Lancashire

Lancashire

Lancashire is a non-metropolitan county of historic origin in the North West of England. It takes its name from the city of Lancaster, and is sometimes known as the County of Lancaster. Although Lancaster is still considered to be the county town, Lancashire County Council is based in Preston...

 and Provence

Provence

Provence ; Provençal: Provença in classical norm or Prouvènço in Mistralian norm) is a region of south eastern France on the Mediterranean adjacent to Italy. It is part of the administrative région of Provence-Alpes-Côte d'Azur...

. He is known from three dedicatory inscriptions. One, at Lancaster, was dedicated (in the dative) to Deo Ialono Contre Sanctissimo ("to the holiest god Ialonus Contre[bis]"); another, at Overborough in Kirkby Lonsdale

Kirkby Lonsdale

Kirkby Lonsdale is a small town and civil parish in the South Lakeland district of Cumbria, England, on the River Lune. Historically within Westmorland, it is situated south east of Kendal along the A65. The parish had a population of 1,771 recorded in the 2001 census.Notable buildings include St...

, to Deo San Gontrebi ("to the holy god Gontrebis"). In the third inscription, found at Nîmes

Nîmes

Nîmes is the capital of the Gard department in the Languedoc-Roussillon region in southern France. Nîmes has a rich history, dating back to the Roman Empire, and is a popular tourist destination.-History:...

 in Provence

Provence

Provence ; Provençal: Provença in classical norm or Prouvènço in Mistralian norm) is a region of south eastern France on the Mediterranean adjacent to Italy. It is part of the administrative région of Provence-Alpes-Côte d'Azur...

, Ialonus was invoked in conjunction with the goddess Fortune

Fortuna

Fortuna can mean:*Fortuna, the Roman goddess of luck -Geographical:*19 Fortuna, asteroid*Fortuna, California, town located on the north coast of California*Fortuna, United States Virgin Islands...

.

The name Contrebis may possibly contain a root related to Proto-Celtic trebo- 'house'. That of Ialonus may be related to the Proto-Celtic root jalo- 'clearing'.