Nicomedia was the metropolis of Bithynia under the Roman Empire, and Diocletian made it the eastern capital city of the Roman Empire in 286 when he introduced the Tetrarchy system.

Nicomedia was the metropolis of Bithynia under the Roman Empire ( see Nicaea ), and Diocletian made it the eastern capital city of the Roman Empire in 286 when he introduced the Tetrarchy system.

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