Dictionary of Greek and Roman Geography/Bergusium
BERGU′SIUM or BERGU′SIA, in Gallia, on the road between Vienna (Vienne) and a place named Augustum. The Antonine Itin. and the Table agree very nearly as to the position of Bergusium, which is xx or xxi M. P. from Vienna, and supposed to be a place named Bourgoin. Augustum is supposed to be Aoste. [ G. L. ]