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The northern provinces. Upper Germany (Germania Superior) contained Helvetia and the city of Aventicum, now Avenches in Switzerland. The triangle at the northern tip of Raetia is Castra Regina, now Regensburg in Germany, the approximate location of my fictional fortress. The expanse to the north was called Germania Magna, the vast unconquered nations. [source: The Complete Roman Army, ©Adrian Goldsworthy] |
| The area in the present day. The Danube is shown in red; the orange triangle is the approximate location of the story's fortress and legion. [source: Wiki Commons] |  |