Europe
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Capitals of the tetrarchy period
Augusta Traverorum (Trier), Mediolanum (Milano) (and later Ravenna), Nicomedia (Izmit) (superseded by Constantinopel) and Sirmium (Sremska Mitrovica)
Augusta Traverorum (Trier), Mediolanum (Milano) (and later Ravenna), Nicomedia (Izmit) (superseded by Constantinopel) and Sirmium (Sremska Mitrovica)