Nicomedia was an ancient Greek city located in what is Turkey.
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In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire, a status which the city maintained during the Tetrarchy system .
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Nicomedia was the metropolis and capital of the Roman province of Bithynia under the Roman Empire.
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Nicomedia was at the center of the Diocletianic Persecution of Christians which occurred under Diocletian and his Caesar Galerius.
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Destruction of the Nicomedia church incited panic in the city, and at the end of the month a fire destroyed part of Diocletian's palace, followed 16 days later by another fire.
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Nicomedia remained as the eastern capital of the Roman Empire until co-emperor Licinius was defeated by Constantine the Great at the Battle of Chrysopolis in 324.
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The metropolis of Nicomedia was ranked 7th in the Notitiae Episcopatuum among the metropolises of the patriarchate.
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However, this last period of Byzantine rule was rather short-lived, as Nicomedia was definitively taken by the Ottomans around 1419.
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Nicomedia was well known for having a bountiful water supply from two to three aqueducts, one of which was built in Hellenistic times.
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Ruins of Nicomedia are buried beneath the densely populated modern city of Izmit, which has largely obstructed comprehensive excavation.
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