Roman emperors ruled the Roman Empire starting with Augustus in 27 BCE and continuing in the West until the late 5th century CE and in the Eastern Roman Empire up to the mid-15th century CE. The emperors took titles such as Caesar and Imperator but it was their command of the army which allowed them to keep the throne.
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Definition
Timeline
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27 BCE - 14 CEReign of Augustus Caesar. Athens and the Agora restored.
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18 Sep 14 CE - 16 Mar 37 CEReign of Roman Emperor Tiberius.
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18 Mar 37 CE - 24 Jan 41 CEReign of Roman Emperor Caligula.
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25 Jan 41 CE - 13 Oct 54 CEReign of Roman Emperor Claudius.
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13 Oct 54 CE - 11 Jun 68 CEReign of Roman emperor Nero.
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68 CE - 69 CEYear of the Four Emperors: Civil war in Rome.
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8 Jun 68 CE - 15 Jan 69 CEReign of Roman Emperor Galba.
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15 Jan 69 CE - 16 Apr 69 CEReign of Roman Emperor Otho.
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17 Apr 69 CE - 20 Dec 69 CEReign of Roman Emperor Vitellius.
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26 Dec 69 CE - 23 Jun 79 CEReign of Roman emperor Vespasian.
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24 Jun 79 CE - 13 Sep 81 CEReign of Roman Emperor Titus.
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14 Sep 81 CE - 18 Sep 96 CEReign of Roman Emperor Domitian.
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18 Sep 96 CE - 27 Jan 98 CEReign of Roman Emperor Nerva.
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28 Jan 98 CE - 7 Aug 117 CEReign of Roman Emperor Trajan.
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11 Aug 117 CE - 10 Jul 138 CEReign of Roman Emperor Hadrian.
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10 Jul 138 CE - 9 Mar 161 CEReign of Roman Emperor Antoninus Pius.
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10 Jul 138 CE - 7 Mar 161 CEReign of Roman Emperor Antonius Pius.
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7 Mar 161 CE - 17 Mar 180 CEReign of Roman Emperor Marcus Aurelius.
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9 Mar 161 CE - Mar 169 CEMarcus Aurelius rules with Lucius Verus.
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Mar 169 CE - 177 CEMarcus Aurelius rules alone.
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177 CE - 17 Mar 180 CEMarcus Aurelius rules with Commodus.
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17 Mar 180 CE - 31 Dec 192 CECommodus rules alone.
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1 Jan 193 CE - 28 Mar 193 CEReign of Roman Emperor Pertinax.
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28 Mar 193 CE - 1 Jun 193 CEReign of Roman Emperor Didius Julianus.
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9 Apr 193 CE - 4 Feb 211 CEReign of Roman Emperor Septimius Severus.
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198 CE - 209 CEReign of Caracalla with his father Septimius Severus.
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209 CE - Dec 211 CEReign of Caracalla with his father Septimius Severus and his brother Geta (Feb - Dec 211 only with Geta).
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209 CE - 26 Dec 211 CEReign of Roman Emperor Geta.
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Dec 211 CE - 8 Apr 217 CEReign of Roman Emperor Caracalla.
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11 Apr 217 CE - 8 Jun 218 CEReign of Roman Emperors Macrinus with his son Diadumenian.
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8 Jun 218 CE - 11 Mar 222 CEReign of Roman Emperor Elagabalus.
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13 Mar 222 CE - 18 Mar 235 CEReign of Roman Emperor Severus Alexander.
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Mar 235 CE - May 238 CEReign of Roman Emperor Maximinus Thrax.
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238 CE - 244 CEReign of Gordian III in Rome.
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22 Mar 238 CE - 12 Apr 238 CEReign of Gordian I and Gordian II in Rome.
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244 CE - 249 CEReign of Philip the Arab in Rome.
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22 Dec 245 CEBirth of Emperor Diocletian.
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249 CE - 251 CEReign of Decius in Rome.
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253 CE - 260 CEReign of Roman emperor Valerian with his son Gallienus as co-emperor.
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253 CEReign of Aemilianus in Rome.
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253 CE - 268 CEReign of Gallienus in Rome.
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Sep 270 CE - c. Sep 275 CEReign of Roman emperor Aurelian.
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284 CE - 305 CEReign of Roman Emperor Diocletian.
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306 CE - 337 CEReign of Roman Emperor Constantine I.
