Alaunus was a Gaulish god of medicine and prophesy. It may also refer to:
Alaunus or Alaunius was a Gaulish god of healing and prophecy. His name is known from inscriptions found in Lurs, Alpes-de-Haute-Provence in southern France and in Mannheim in western Germany. In the latter inscription, Alaunus is used as an epithet of Mercury. The name of this deity is also found as a placename both of sites and rivers. Its feminine form Alauna appears in the Roman-era names of Valognes in Normandy, Maryport and Watercrook in Cumbria, Alcester in Warwickshire, Ardoch in Perthshire, and Learchild and the River Aln in Northumberland.
Gallo-Roman religion was a fusion of the traditional religious practices of the Gauls, who were originally Celtic speakers, and the Roman and Hellenistic religions introduced to the region under Roman Imperial rule. It was the result of selective acculturation.
- Alaunus, the Roman name of the River Aulne in Brittany
- Alaunus, the Roman name of a river on Great Britain variously identified with the Aln or Allan
The Aulne is a 144 km (89 mi) long river of Brittany in north-western France, flowing down the hills and emptying into the roadstead of Brest, one of the many fjord-like bays just south of Brest. The river is part of the Canal de Nantes à Brest, the navigation canal that once connected the city of Nantes on the Loire with the port town of Brest on the Atlantic coast. This canal is still navigable over part of its length, but sea-going traffic is interrupted by the hydro-electric dam of Guerledan, which submerged a number of the original locks of the canal. The Aulne flows through Châteaulin.
The River Aln runs through the county of Northumberland in England. It rises in Alnham in the Cheviot Hills and discharges into the North Sea at Alnmouth on the east coast of England.
