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"There was a dream that was Rome"
27 BC–68 AD: Julio-Claudian dynasty
68–96: Year of the Four Emperors and Flavian dynasty
96–192: Nerva–Antonine dynasty
193–235: Year of the Five Emperors and Severan dynasty
235–285: Gordian dynasty and Crisis of the Third Century
284–364: Tetrarchy and Constantinian dynasty
364–392: Valentinian dynasty
392–455: Theodosian dynasty
455–476: Last emperors of the Western Empire