Neolithic enclosures with pseudo-ditches: Danubian ceremonial monuments in the Alsace Plain

The recent discovery of seven Neolithic sites in the Alsace Plain with “Rosheim” enclosures has renewed the interpretation of these extensive complexes dated to the 5th millennium BC. This very particular type of enclosure, whose eponymous site is located about twenty kilometres from Strasbourg, is made up of discontinuous ditches, following a pre-established layout, which are progressively filled in. New analysis of these monuments is accompanied by a reflection on their function (ceremonial or defensive), enabling us to provide a coherent account of the origin and important geographical extension of these enclosures, which are found in numerous cultural groups over more than two millennia of European history, from Poland to England and from Bavaria to Denmark.