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In page Trieste:

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The city was witness to the Battle of the Frigidus in the Vipava Valley in AD 394, in which Theodosius I defeated Eugenius. Despite the deposition of Romulus Augustulus at Ravenna in 476 and Odoacer's ascension to power in Italy, Trieste came under the control of the Roman Emperor seated at Constantinople, and thus became a Byzantine military outpost.[citation needed] In 539, the Byzantines annexed it to the Exarchate of Ravenna, despite Trieste being briefly taken by the Lombards in 567 during their invasion of northern Italy, it remained part of the Exarchate until the Frankish invasion .[citation needed]