Answer: The oppidum of the Allobroges became a Roman colony about 47 BC under Julius Caesar, but the Allobroges managed to expel the Romans; the exiles then founded the colony of Lugdunum (today's Lyon).[4] Ethnarch of Judea Herod Archelaus was exiled here in 6 AD.[5] During the early Empire, Vienna (as the Romans called it—not to be confused with today's Vienna, then known as Vindobona) regained all its former privileges as a Roman colony. In 260 Postumus was proclaimed Emperor here of a short-lived Gallo-Roman Empire. Later it became a provincial capital of the Dioecesis Viennensis.
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