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Roman Emperors: Chronological List (27 BC – AD 476)
From Augustus to the fall of the Western Empire — grouped by dynasties and key periods.
🏛️ Julio-Claudian Dynasty
27 BC – AD 68 · The founding dynasty that established imperial Rome.
- Augustus
- Tiberius
- Caligula
- Claudius
- Nero
⚔️ Year of the Four Emperors
AD 69 · A rapid civil war year.
- Galba
- Otho
- Vitellius
- Vespasian
🦁 Flavian Dynasty
AD 69–96 · Builders of the Colosseum.
- Vespasian
- Titus
- Domitian
🌟 The Five Good Emperors & Nerva–Antonine Dynasty
AD 96–192 · Peak of Roman territorial and civic power.
- Nerva
- Trajan
- Hadrian
- Antoninus Pius
- Marcus Aurelius
- Commodus
⚜️ Severan Dynasty
AD 193–235 · Military monarchy & African emperors.
- Septimius Severus
- Caracalla
- Geta
- Elagabalus
- Severus Alexander
🌩️ Crisis of the Third Century
AD 235–284 · Chaotic period with many short-reigning emperors. Key figures include:
- Maximinus Thrax
- Gordian III
- Philip the Arab
- Decius
- Valerian
- Gallienus
- Aurelian
📜 Note: Dozens of barracks emperors rose and fell during this instability. The list above includes the most significant rulers of the era.
🏺 Late Empire & Dominate
AD 284–476 · Reforms, tetrarchy, and Christianization.
- Diocletian
- Constantine the Great
- Julian (the Apostate)
- Theodosius I
⛅ Final Western Roman Emperors
AD 395–476 · The last rulers in the West before collapse.
- Honorius
- Valentinian III
- Romulus Augustulus (deposed 476 AD)
📖 A chronological reference — from Augustus to the last Western emperor.
For a complete exhaustive list (including every short-lived claimant), deeper timeline or key achievements, further expansions are possible.
🏛️ Complete Roman Emperors Timeline
27 BC – AD 1453 · Augustus → Constantine XI · Principate → Dominate → Eastern Roman (Byzantine) Empire
🏺 Early Roman Empire Principate · 27 BC – AD 235
Julio-Claudian Dynasty
- Augustus (27 BC–14 AD)
- Tiberius
- Caligula
- Claudius
- Nero
Year of the Four Emperors (AD 69)
- Galba
- Otho
- Vitellius
- → Vespasian (founder of Flavian)
Flavian Dynasty
- Vespasian
- Titus
- Domitian
Adoptive & Five Good Emperors
- Nerva
- Trajan
- Hadrian
- Antoninus Pius
- Marcus Aurelius
- Commodus
Severan Dynasty
- Septimius Severus
- Caracalla
- Geta
- Macrinus usurper-emperor
- Elagabalus
- Severus Alexander
⚡ Crisis of the Third Century AD 235–284 · chaotic barracks emperors
- Maximinus Thrax
- Gordian I & II
- Gordian III
- Philip the Arab
- Decius
- Trebonianus Gallus
- Valerian
- Gallienus
- Claudius Gothicus
- Aurelian
- Tacitus
- Probus
- Carus
- Carinus
- Numerian
🧩 Breakaway states (usurpers / independent rulers): Postumus (Gallic Empire), Zenobia (Palmyrene Empire – ruled as regent/queen, de facto control over eastern provinces).
👑 Late Roman Empire Dominate · AD 284–395 (reunited phase)
Diocletian & Tetrarchy
- Diocletian
- Maximian
- Galerius
- Constantius Chlorus
Constantinian Dynasty
- Constantine the Great
- Constantine II
- Constantius II
- Constans
- Julian "the Apostate"
- Jovian
Valentinian & Theodosian House
- Valentinian I
- Valens
- Gratian
- Valentinian II
- Theodosius I last ruler of united empire, d. 395 AD
🌄 Western Roman Empire AD 395 – 476 · final decades & collapse
- Honorius
- Constantius III
- Valentinian III
- Petronius Maximus
- Avitus
- Majorian
- Libius Severus
- Anthemius
- Olybrius
- Glycerius
- Julius Nepos legitimate claimant in exile
- Romulus Augustulus deposed 476 AD · last Western emperor
📍 After 476, Odoacer ruled Italy as a client king. The imperial insignia were sent to Constantinople, legally acknowledging that the Eastern emperor remained the sole Roman sovereign.
🏛️ Eastern Roman (Byzantine) Empire AD 395 – 1453 · 1,058 years of continuation
Early Byzantine (5th–7th c.)
- Arcadius
- Theodosius II
- Marcian
- Leo I
- Zeno
- Anastasius I
- Justin I
- Justinian I (reconquered Rome, Corpus Juris)
- Justin II
- Maurice
- Phocas
- Heraclius
Middle Byzantine (7th–11th c.)
- Constans II
- Justinian II
- Leo III (Isaurian)
- Constantine V
- Irene (first empress regnant)
- Basil I (Macedonian)
- Leo VI the Wise
- Constantine VII Porphyrogennetos
- Romanos I Lekapenos
- Nikephoros II Phokas
- John I Tzimiskes
- Basil II "Bulgar Slayer" (976–1025)
Late Byzantine (11th–15th c.)
- Alexios I Komnenos
- John II Komnenos
- Manuel I Komnenos
- Isaac II Angelos
- Alexios V Doukas
- Michael VIII Palaiologos (reconquered Constantinople, 1261)
- Andronikos II & III
- John V Palaiologos
- Manuel II Palaiologos
- John VIII Palaiologos
- Constantine XI Palaiologos (1449–1453) · fell defending Constantinople, 29 May 1453
~200+ rulers (legitimate + major claimants)
476 AD Western fall
1453 AD Eastern fall
~1480 yrs total Roman imperial system
🏛️ From Octavian's principate to Constantine XI's heroic last stand — the continuous Roman imperial tradition spanned 1,480 years.
🏛️ Roman Emperors: Dynasty & Succession Tree
From Augustus to Constantine XI (27 BC – AD 1453) · Full Mermaid Flowchart
📜 This visual diagram traces the imperial dynasties of Rome — from the founding of the Principate under Augustus, through the
Julio-Claudian, Flavian, Nerva–Antonine, Severan, the Crisis of the Third Century, Tetrarchy, Constantinian, Theodosian,
and the continued Eastern Roman (Byzantine) Empire all the way to the last Roman emperor in 1453.
Click nodes, scroll, zoom — interactive Mermaid.js chart.
flowchart TD
AUG[("Augustus (27 BC–14 AD)
founder of the Empire")]
%% JULIO-CLAUDIAN
subgraph JULIO [Julio-Claudian Dynasty]
direction TB
AUG --> TIB["Tiberius
(adopted son)"]
TIB --> CAL["Caligula
(great-nephew / adopted line)"]
CAL --> CLAUD["Claudius
(uncle of Caligula)"]
CLAUD --> NERO["Nero
(adopted son / step-family)"]
end
%% 69 AD collapse
COLLAPSE[("Civil War & Collapse (AD 69)
Year of the Four Emperors")]
JULIO --> COLLAPSE
%% FLAVIAN
subgraph FLAVIAN [Flavian Dynasty]
VESP["Vespasian (69–79)
military founder"] --> TITUS["Titus (son)"]
VESP --> DOM["Domitian (son)"]
end
COLLAPSE --> VESP
%% NERVA-ANTONINE adoption system
subgraph NERVA [Nerva–Antonine Dynasty (Adoptive Emperors)]
NER["Nerva (96–98)"] --> TRAJ["Trajan (adopted)"]
TRAJ --> HAD["Hadrian (adopted)"]
HAD --> ANT["Antoninus Pius (adopted)"]
ANT --> MA["Marcus Aurelius (adopted)"]
MA --> COMM["Commodus
(biological son – ends stability)"]
end
DOM --> NER
%% SEVERAN
subgraph SEVERAN [Severan Dynasty]
SEV["Septimius Severus (193–211)"] --> CARA["Caracalla (son)"]
SEV --> GETA["Geta (son, co-emperor)
killed by Caracalla"]
SEV -.->|female line| ELAG["Elagabalus (relative)"]
ELAG --> ALEX["Severus Alexander
(cousin line)"]
end
COMM --> SEV
%% CRISIS 3rd CENTURY
CRISIS[("Crisis of the Third Century (235–284)
No stable dynasties – army coups")]
SEVERAN --> CRISIS
%% TETRARCHY (Diocletian)
subgraph TET [Tetrarchy (Diocletianic System)]
DIOC["Diocletian (284–305)
creator of Tetrarchy"] --> MAXIM["Maximian"]
DIOC --> GAL["Galerius"]
DIOC --> CONSTCHLOR["Constantius Chlorus"]
end
CRISIS --> DIOC
%% CONSTANTINIAN DYNASTY
subgraph CONST [Constantinian Dynasty]
CONSTCHLOR --> CONSTG["Constantine the Great (306–337)
reunites empire, founds dynasty"]
CONSTG --> CONSTII["Constantine II (son)"]
CONSTG --> CONSTIUS["Constantius II (son)"]
CONSTG --> CONSTANS["Constans (son)"]
CONSTIUS --> JULIAN["Julian 'the Apostate'
(cousin branch)"]
end
%% THEODOSIAN DYNASTY + split
subgraph THEODOSIAN [Theodosian Dynasty & Empire Split]
THEOD["Theodosius I (379–395)
last ruler of united empire"]
THEOD --> ARCAD["Arcadius (Eastern Roman Empire)"]
THEOD --> HONOR["Honorius (Western Roman Empire)"]
HONOR --> VALIII["Valentinian III
(Western, by marriage alliance)"]
end
JULIAN --> THEOD
%% Western fragment
WESTEND[("Western Roman Empire ends 476 AD
Romulus Augustulus deposed")]
VALIII --> WESTEND
%% BYZANTINE (Eastern continuation)
subgraph BYZ [Eastern Roman (Byzantine) Empire – continues until 1453]
direction TB
subgraph JUST [Justinian Dynasty]
JUSTIN_I["Justin I (518–527)"] --> JUSTIN_I_["Justinian I the Great"]
JUSTIN_I_ --> JUSTIN_II["Justin II"]
end
subgraph HERAC [Heraclian Dynasty]
HERACLIUS["Heraclius (610–641)"] --> CONSTIII["Constantine III"]
HERACLIUS --> HERACLONAS["Heraclonas"]
end
subgraph MAC [Macedonian Dynasty (Golden Age)]
BASIL_I["Basil I (867–886)"] --> LEO_VI["Leo VI the Wise"]
LEO_VI --> CONST_VII["Constantine VII"]
CONST_VII --> BASIL_II["Basil II 'Bulgar Slayer'
(976–1025)"]
end
subgraph KOMN [Komnenian Dynasty]
ALEXIOS_I["Alexios I Komnenos (1081–1118)"] --> JOHN_II["John II Komnenos"]
JOHN_II --> MANUEL_I["Manuel I Komnenos"]
end
subgraph PALEO [Palaiologan Dynasty – Final Roman Emperors]
MICHAEL_VIII["Michael VIII Palaiologos
(reconquers Constantinople, 1261)"] --> ANDRO_II["Andronikos II"]
ANDRO_II --> ANDRO_III["Andronikos III"]
ANDRO_III --> JOHN_V["John V Palaiologos"]
JOHN_V --> CONST_XI["Constantine XI Palaiologos
(last Roman emperor, died 1453)"]
end
end
ARCAD --> JUSTIN_I
ARCAD --> HERACLIUS
ARCAD --> BASIL_I
ARCAD --> ALEXIOS_I
ARCAD --> MICHAEL_VIII
%% Styling classes
classDef founder fill:#d4af37,stroke:#8b5a2b,stroke-width:2px,color:#2c2c2c,font-weight:bold
classDef dynasty fill:#e8dccc,stroke:#b78f50,stroke-width:1.5px
classDef crisis fill:#d9c2a7,stroke:#a5713c,stroke-dasharray:4 2
classDef byz fill:#c3d7b5,stroke:#5b7a3a,stroke-width:1.5px
classDef westend fill:#c2b2a3,stroke:#7a5a3a
class AUG,CONSTG,THEOD,JUSTIN_I_,BASIL_II,CONST_XI founder
class JULIO,FLAVIAN,NERVA,SEVERAN,CONST,THEODOSIAN dynasty
class COLLAPSE,CRISIS,WESTEND crisis
class BYZ,JUST,HERAC,MAC,KOMN,PALEO byz
🏆 Founding / Great Emperors
🏛️ Major Dynasties (West)
⚡ Crisis / Collapse Periods
🌿 Byzantine (Eastern) Dynasties
🏺 End of Western Empire
🏛️ Roman Emperors: Dynasty & Succession Tree
From Augustus to Constantine XI (27 BC – AD 1453) · Interactive Mermaid Flowchart
📜 This visual diagram traces the imperial dynasties of Rome — from the founding of the Principate under Augustus, through the
Julio-Claudian, Flavian, Nerva–Antonine, Severan, the Crisis of the Third Century, Tetrarchy, Constantinian, Theodosian,
and the continued Eastern Roman (Byzantine) Empire all the way to the last Roman emperor in 1453.
Scroll, zoom, and explore — fully interactive chart.
flowchart TD
Augustus("Augustus (27 BC–14 AD)
founder of the Empire")
%% JULIO-CLAUDIAN
subgraph JULIO["Julio-Claudian Dynasty"]
Tiberius["Tiberius (adopted son)"]
Caligula["Caligula (great-nephew)"]
Claudius["Claudius (uncle of Caligula)"]
Nero["Nero (adopted son)"]
Augustus --> Tiberius
Tiberius --> Caligula
Caligula --> Claudius
Claudius --> Nero
end
%% Collapse 69 AD
Collapse69["Civil War & Collapse (AD 69)
Year of the Four Emperors"]
Nero --> Collapse69
%% FLAVIAN
subgraph FLAVIAN["Flavian Dynasty"]
Vespasian["Vespasian (69–79)
military founder"]
Titus["Titus (son)"]
Domitian["Domitian (son)"]
Vespasian --> Titus
Vespasian --> Domitian
end
Collapse69 --> Vespasian
%% NERVA-ANTONINE
subgraph NERVA["Nerva–Antonine Dynasty (Adoptive Emperors)"]
Nerva["Nerva (96–98)"]
Trajan["Trajan (adopted)"]
Hadrian["Hadrian (adopted)"]
Antoninus["Antoninus Pius (adopted)"]
MarcusAurelius["Marcus Aurelius (adopted)"]
Commodus["Commodus (biological son)"]
Nerva --> Trajan
Trajan --> Hadrian
Hadrian --> Antoninus
Antoninus --> MarcusAurelius
MarcusAurelius --> Commodus
end
Domitian --> Nerva
%% SEVERAN DYNASTY
subgraph SEVERAN["Severan Dynasty"]
Septimius["Septimius Severus (193–211)"]
Caracalla["Caracalla (son)"]
Geta["Geta (son, co-emperor)
killed by Caracalla"]
Elagabalus["Elagabalus (relative via female line)"]
SeverusAlexander["Severus Alexander (cousin line)"]
Septimius --> Caracalla
Septimius --> Geta
Septimius -.-> Elagabalus
Elagabalus --> SeverusAlexander
end
Commodus --> Septimius
%% CRISIS
Crisis["Crisis of the Third Century (235–284)
No stable dynasties – army coups"]
SeverusAlexander --> Crisis
%% TETRARCHY
subgraph TET["Tetrarchy (Diocletianic System)"]
Diocletian["Diocletian (284–305)
creator of Tetrarchy"]
Maximian["Maximian"]
Galerius["Galerius"]
ConstantiusChlorus["Constantius Chlorus"]
Diocletian --> Maximian
Diocletian --> Galerius
Diocletian --> ConstantiusChlorus
end
Crisis --> Diocletian
%% CONSTANTINIAN
subgraph CONST["Constantinian Dynasty"]
ConstantineGreat["Constantine the Great (306–337)
reunites empire"]
ConstantineII["Constantine II (son)"]
ConstantiusII["Constantius II (son)"]
Constans["Constans (son)"]
Julian["Julian the Apostate (cousin branch)"]
ConstantiusChlorus --> ConstantineGreat
ConstantineGreat --> ConstantineII
ConstantineGreat --> ConstantiusII
ConstantineGreat --> Constans
ConstantiusII --> Julian
end
%% THEODOSIAN
subgraph THEODOSIAN["Theodosian Dynasty & Empire Split"]
TheodosiusI["Theodosius I (379–395)
last ruler of united empire"]
Arcadius["Arcadius (Eastern Roman Empire)"]
Honorius["Honorius (Western Roman Empire)"]
ValentinianIII["Valentinian III (Western, by marriage)"]
TheodosiusI --> Arcadius
TheodosiusI --> Honorius
Honorius --> ValentinianIII
end
Julian --> TheodosiusI
%% WESTERN END
WesternEnd["Western Roman Empire ends 476 AD
Romulus Augustulus deposed"]
ValentinianIII --> WesternEnd
%% BYZANTINE SECTION
subgraph BYZ["Eastern Roman (Byzantine) Empire – continues until 1453"]
subgraph JUST["Justinian Dynasty"]
JustinI["Justin I (518–527)"]
JustinianI["Justinian I the Great"]
JustinII["Justin II (nephew)"]
JustinI --> JustinianI
JustinianI --> JustinII
end
subgraph HERAC["Heraclian Dynasty"]
Heraclius["Heraclius (610–641)"]
ConstantineIII["Constantine III"]
Heraclonas["Heraclonas"]
Heraclius --> ConstantineIII
Heraclius --> Heraclonas
end
subgraph MAC["Macedonian Dynasty (Golden Age)"]
BasilI["Basil I (867–886)"]
LeoVI["Leo VI the Wise"]
ConstantineVII["Constantine VII"]
BasilII["Basil II 'Bulgar Slayer' (976–1025)"]
BasilI --> LeoVI
LeoVI --> ConstantineVII
ConstantineVII --> BasilII
end
subgraph KOMN["Komnenian Dynasty"]
AlexiosI["Alexios I Komnenos (1081–1118)"]
JohnII["John II Komnenos"]
ManuelI["Manuel I Komnenos"]
AlexiosI --> JohnII
JohnII --> ManuelI
end
subgraph PALEO["Palaiologan Dynasty – Final Roman Emperors"]
MichaelVIII["Michael VIII Palaiologos (1261)"]
AndronikosII["Andronikos II"]
AndronikosIII["Andronikos III"]
JohnV["John V Palaiologos"]
ConstantineXI["Constantine XI Palaiologos
last Roman emperor, died 1453"]
MichaelVIII --> AndronikosII
AndronikosII --> AndronikosIII
AndronikosIII --> JohnV
JohnV --> ConstantineXI
end
end
%% Connect Eastern line from Arcadius
Arcadius --> JustinI
Arcadius --> Heraclius
Arcadius --> BasilI
Arcadius --> AlexiosI
Arcadius --> MichaelVIII
%% Styling
classDef founder fill:#d4af37,stroke:#8b5a2b,stroke-width:2px,color:#2c2c2c,font-weight:bold
classDef dynasty fill:#e8dccc,stroke:#b78f50,stroke-width:1.5px
classDef crisis fill:#d9c2a7,stroke:#a5713c,stroke-dasharray:4 2
classDef byz fill:#c3d7b5,stroke:#5b7a3a,stroke-width:1.5px
classDef westend fill:#c2b2a3,stroke:#7a5a3a
class Augustus,ConstantineGreat,TheodosiusI,JustinianI,BasilII,ConstantineXI founder
class JULIO,FLAVIAN,NERVA,SEVERAN,CONST,THEODOSIAN dynasty
class Collapse69,Crisis,WesternEnd crisis
class BYZ,JUST,HERAC,MAC,KOMN,PALEO byz
🏆 Founding / Great Emperors
🏛️ Major Dynasties (West)
⚡ Crisis / Collapse Periods
🌿 Byzantine (Eastern) Dynasties
🏺 End of Western Empire

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