Ravenna
Ravenna was the capital of the Western Roman Empire in the 400s, of the Ostrogoth Kingdom in the early 500s, and seat of the Exarchate of Ravenna until 751.
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Invasions of Italy in Late Antiquity
In late Antiquity the north-east of the Italian peninsula suffered many invasions. The wars caused people to move to the safer lagoon areas, and hence to the foundation of Venice.