Ravenna , Province of Ravenna, Emilia Romagna, Italy
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It was an important base of the Roman fleet, and Classis (from the Latin for fleet) was the name given to port, protected by its walls. The imperial Porta Aurea of Classis was demolished only in the 16th century. Columns from Classis were scattered among Christian churches in Ravenna, and even to Venice.
After 404, when Ravenna was an imperial residence, it gained its most famous monuments, both secular (demolished) and Christian (largely preserved). In 493 Ravenna became was the capital of Theodoric, king of the Ostrogoths. After the battle of Verona, Odoacer retreated to Ravenna, where he withstood a siege of three years by Theodoric, until the conquest of Rimini deprived Ravenna of supplies. Theodoric employed Roman architects for secular and religious structures, including the lost Palace near San Apollinare Nuovo. The palace was sacked by the Byzantines in 539, then became the seat of the exarchs and of the King of the Lombards. Charlemagne took away columns of this palace for his own palace at Aachen. The last tower that remained of the palace of Theodoric was destroyed in 1295.
Following the conquests of Belisarius for Emperor Justinian I in the sixth century AD, Ravenna became the seat of the Byzantine governor of Italy, the Exarch, and was known as the Exarchate of Ravenna. After the Byzantine withdrawal Ravenna was ruled by legates of the Pope as one of the Papal States. It became part of the Kingdom of Italy in 1861.