YearEmperorYearEmperorYearEmperor
23 B.CAugustus217Macrius305-307Flavius Severus
14A.DTiberius218Elagabalus308-324Licinus
37Gaius(Caligula)222Severus/Alexander306-337Constantine I
41Claudius235Maximin/Thrax337-340Constantine II
54Nero238Gordian I, II, III337-350Constans
68-69Galba244Philip and others337-361Constantius II
69Otho and Vitellius249Decius and others361-363Julian
69Vespasian253Gallienus and others363-364Jovian
79Titus268Claudius II364-375Valentinian
81Domitian269Aurelian and others364-375Valens
96Nerva275Tacitus367-383Gratian
97Trajan276Probus375-393Valentinian II
117Hadrian282Carus379-395Theodosius I
138Antoninus Pius283Carinus and Numerian385-388Maximus
161-180Marcus Aurelius**392-394Eugenius
176-192Commodus284-305Diocletian395-423Honorius
193Pertinax286-305Maximian425-455Valentinian III
193-211Septimus Severus293-296Constantius Chlorus457-474Leo I
198-217Caracella293-311Galerius475-476Romulus Augustulus

*= Empire split into four sections under two Augusti and two Caesars