Basel-Münsterhügel is the site of an Iron Age (late La Tène) fort or oppidum, known as Basel oppidum, constructed by the Gaulish Rauraci after the battle of Bibracte in 58 BC. It the site of Basel Minster, in the Swiss city of Basel.The fort was abandoned or destroyed shortly after its construction, before the end of the 1st century BC, with the Roman conquest of the Alps and the establishment of the province of Gallia Belgica.