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Main centre of the Segusini in the Alpes Cottiae, modern Susa (Plin. HN 3,123: regio XI; Ptol. 3,1,40 erroneously places S. in the Alpes Graiae [2. 393-408; 3. 331-333]). S. commanded the route over Mont Genèvre and was the gateway into Italy (Amm. Marc. 15,10,3; Pan. Lat. 4,17,3; 21; 22,2). S. possessed Latin law probably from the time of Augustus and was a municipium from the time of Nero. Constantinus [1] conquered S. in AD 312. Outstanding monuments are an Augustine arch with an inscription…