| Trebonianus Gallus |
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| Reign | 251–253 |
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| Born | Gaius Vibius Trebonianus Gallus |
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Trebonianus Gallus was Roman emperor from 251 to 253 AD.
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Principate 27 BC – 284 AD | Crisis 235–284 | |
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| Gallic |
- Postumus
- Laelianus
- Marius
- Victorinus
- Domitianus II
- Tetricus I with Tetricus II
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| Palmyrene |
- Vaballathus
- Zenobia
- Septimius Antiochus
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Dominate 284–610 | |
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Eastern/ Byzantine Empire 610–1204 |
- Heraclius
- Constantine III
- Heraklonas
- Constans II
- Constantine IV with Heraclius and Tiberius and then Justinian II
- Justinian II with Tiberius
- Leontios
- Tiberios III
- Philippikos
- Anastasios II
- Theodosius III
- Leo III the Isaurian
- Constantine V
- Artabasdos
- Leo IV the Khazar
- Constantine VI
- Irene
- Nikephoros I
- Staurakios
- Michael I Rangabe with Theophylact
- Leo V the Armenian with Symbatios-Constantine
- Michael II the Amorian
- Theophilos
- Michael III
- Basil I the Macedonian
- Leo VI the Wise
- Alexander
- Constantine VII Porphyrogennetos
- Romanos I Lekapenos with Christopher, Stephen and Constantine
- Romanos II
- Nikephoros II Phokas
- John I Tzimiskes
- Basil II
- Constantine VIII
- Zoe with Romanos III Argyros with Michael IV the Paphlagonian with Theodora
- Michael V Kalaphates
- Constantine IX Monomachos
- Theodora
- Michael VI Bringas
- Isaac I Komnenos
- Constantine X Doukas
- Romanos IV Diogenes
- Michael VII Doukas with Andronikos and Konstantios and Constantine
- Nikephoros III Botaneiates
- Alexios I Komnenos
- John II Komnenos with Alexios Komnenos
- Manuel I Komnenos
- Alexios II Komnenos
- Andronikos I Komnenos
- Isaac II Angelos
- Alexios III Angelos
- Alexios IV Angelos
- Nicholas Kanabos as usurper chosen by the Senate
- Alexios V Doukas
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Empire of Nicaea 1204–1261 |
- Constantine Laskaris
- Theodore I Laskaris
- John III Doukas Vatatzes
- Theodore II Laskaris
- John IV Laskaris
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Eastern/ Byzantine Empire 1261–1453 |
- Michael VIII Palaiologos
- Andronikos II Palaiologos with Michael IX Palaiologos
- Andronikos III Palaiologos
- John V Palaiologos
- John VI Kantakouzenos with John V Palaiologos and Matthew Kantakouzenos
- John V Palaiologos
- Andronikos IV Palaiologos
- John VII Palaiologos
- Andronikos V Palaiologos
- Manuel II Palaiologos
- John VIII Palaiologos
- Constantine XI Palaiologos
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Italics usually indicate an usurper or co-emperor. |