Roman imperial dynasties Theodosian dynasty Chronology Theodosius I as Emperor of the East 379–392 Theodosius I as sole emperor 392–395 -with Arcadius as junior Augustus of the East 383–395 Honorius as Emperor of the West 395–423 Arcadius as Emperor of the East 395–408 Theodosius II as Emperor of the East 408–450 Marcian as Emperor of the East 450–457 Succession Preceded by Valentinian dynasty Followed by Leonid dynasty