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The Roman B. was preceded by a Celtic settlement of Helvetii and Rauraci. First, a large, open settlement existed in the late 2nd cent. in the Rhine plain (Basel-Gasfabrik), to which also belonged a field of cremation graves. During the early 1st cent., the Münsterhügel housed an oppidum fortified with murus gallicus, which perhaps was vacated when the Helvetii left the area in 58 BC.