3rd-century Roman emperors

Diocletian ( ; ; ; 242/245 – 311/312), nicknamed Jovius, was Roman emperor from 284 until his abdication in 305. He was born Diocles to a family of low status in the Roman province of Dalmatia. As with other Illyrian soldiers of the period, Diocles rose through the ranks of the military early in his career, serving under Aurelian and Probus, and eventually becoming a cavalry commander for the army of Emperor Carus. After the deaths of Carus and his son Numerian on a campaign in Persia, Diocles was proclaimed emperor by the troops, taking the name "Diocletianus". The title was also claimed by C

Roman emperor from 193 to 211

Marcus Aurelius Antoninus (born Lucius Septimius Bassianus, 4 April 188 – 8 April 217), better known by his nickname Caracalla (; ), was Roman emperor from 198 to 217 AD, first serving as nominal co-emperor under his father and then ruling alone after 211 AD. He was a member of the Severan dynasty, the elder son of Emperor Septimius Severus and Empress Julia Domna. Severus proclaimed Caracalla co-ruler in 198, doing the same with his other son Geta in 209. The two brothers briefly shared power after their father's death in 211, but Caracalla soon had Geta murdered by the Praetorian Guard

Aurelian (; ; 9 September ) was a Roman emperor from 270 to 275 during the Crisis of the Third Century. During his reign, he won an unprecedented series of military victories which reunited the Roman Empire after it had nearly disintegrated under the pressure of barbarian invasions and internal revolts. For his success in restoring the Empire's territorial integrity, Aurelian was honored with the title ("Restorer of the World").

Marcus Aurelius Antoninus (born Sextus Varius Avitus Bassianus, 204 – 13 March 222), better known by his posthumous nicknames Elagabalus ( ) and Heliogabalus ( ), was Roman emperor from 218 to 222, while he was still a teenager. His short reign was notorious for religious controversy and alleged sexual debauchery. A close relative to the Severan dynasty, he came from a prominent Syrian Arab family in Emesa (Homs), Syria, where he served as the head priest of the sun god Elagabal from a young age. After the death of his cousin, the emperor Caracalla, Elagabalus was raised to the Principate at 1

Roman Emperor (208-235)

Marcus Opellius Macrinus (; – June 218) was a Roman emperor who reigned from April 217 to June 218, jointly with his young son Diadumenianus. Born in Caesarea (now called Cherchell, in modern Algeria), in the Roman province of Mauretania Caesariensis to an equestrian family of Berber origins, he became the first emperor who did not hail from the senatorial class and also the first emperor who never visited Rome during his reign. Before becoming emperor, Macrinus served under Emperor Caracalla as a praetorian prefect and dealt with Rome's civil affairs. He later conspired against Caracalla and

Gaius Messius Quintus Trajanus Decius ( 201June 251), known as Trajan Decius or simply Decius (), was Roman emperor from 249 to 251.

Roman Emperor (204-249)

Roman emperor (250-306)

Roman emperor

Roman Emperor (173-238)

Roman Emperor from 268 to 270 (213–270)

Roman emperor (225-244)

Roman Emperor

Publius Licinius Egnatius Gallienus (, ; – September 268) was Roman emperor with his father Valerian from 253 to 260 and alone from 260 to 268. He ruled during the Crisis of the Third Century that nearly caused the collapse of the empire. He won numerous military victories against usurpers and Germanic tribes, but was unable to prevent the secession of important provinces. His 15-year reign was the longest in half a century.

Roman emperor from 209 to 211

Maximian (; ), nicknamed Herculius, was Roman emperor from 286 to 305. He was Caesar from 285 to 286, then Augustus from 286 to 305. He shared the latter title with his co-emperor and superior, Diocletian, whose political brain complemented Maximian's military brawn. Maximian established his residence at Trier but spent most of his time on campaign. In late 285, he suppressed rebels in Gaul known as the Bagaudae. From 285 to 288, he fought against Germanic tribes along the Rhine frontier. Together with Diocletian, he launched a scorched earth campaign deep into Alamannic territory in 288, refo

Galerius Valerius Maximianus (; Greek: Γαλέριος; 258 – May 311) was Roman emperor from 305 to 311. He participated in the system of government later known as the Tetrarchy, first acting as caesar under Emperor Diocletian. In this period Galerius obtained victory warring against the Persian Sasanian Empire, defeating Narseh at the battle of Satala in 298 and possibly sacking the Sasanian capital of Ctesiphon in 299. He also campaigned across the Danube against the Carpi, defeating them in 297 and 300. Galerius was promoted to augustus upon the abdication of Diocletian in 305, but had to contend

Marcus Clodius Pupienus Maximus ( 164–238) was Roman emperor with Balbinus for 99 days in 238, during the Year of the Six Emperors. The sources for this period are scant, and thus knowledge of the emperor is limited. In most contemporary texts he is referred to by his cognomen "Maximus" rather than by his second nomen (family name) Pupienus ().

Marcus Aemilius Aemilianus ( – September 253), also known as Aemilian, was Roman emperor for two months in 253.

3rd-century Roman Emperor (232-282)

Marcus Aurelius Claudius Quintillus (died 270) was a short-lived Roman emperor. He took power after the death of his brother, Emperor Claudius Gothicus, in 270. After reigning for a few weeks Quintillus was overthrown by Aurelian, who had been proclaimed rival emperor by the legions he commanded. The ancient sources variously report him to have killed himself, to have fallen in battle against Aurelian, or to have been murdered by his own soldiers.

Decimus Caelius Calvinus Balbinus (July/August 238 AD) was Roman emperor with Pupienus for three months in 238, the Year of the Six Emperors.

Roman emperor from 275 to 276

Roman Emperor from 251 to 253 (206-253)

Roman Emperor in 238 AD

Marcus Aurelius Carus ( – July or August 283) was Roman emperor from 282 to 283. During his short reign, Carus fought the Germanic tribes and Sarmatians along the Danube frontier with success.

Diadumenian ( ; ; 14September 208 – June 218) was the son of the Roman emperor Macrinus and served as his co-ruler for a brief time in 218. His mother, Macrinus' wife, is called Nonia Celsa in the unreliable , though this name may have been fictional. Diadumenian became in May 217, shortly after his father's accession to the imperial throne. Elagabalus, a relative of the recently deceased Caracalla, revolted in May of the following year, and Diadumenian was elevated to co-emperor. After Macrinus was defeated in the Battle of Antioch on 8 June 218, Diadumenian was sent to the court of Artabanus

Marcus Annius Florianus (died 276), also known as Florian, was briefly Roman emperor in the year 276. He took the throne after the murder of his half-brother Tacitus, but was killed after 88 days by his own troops during his confrontation with the rival emperor Probus, who took over the Eastern provinces after Tacitus' death.

thumb|A Roman Antoninianus|radiate produced in 283 depicting Emperor Carinus. From the collection of [[York Museums Trust. Legend: M. AVR. CARINVS NOB. CAES.]]

Hostilian (; died July 251) was briefly Roman emperor in 251. Hostilian was born to Decius and Herennia Etruscilla at an unknown date and elevated to caesar in 250 by Decius. After Decius and Herennius Etruscus, Hostilian's brother, were killed at the Battle of Abritus, an ambush by the Goths, Trebonianus Gallus was proclaimed emperor by the legions. Almost immediately, he elevated Hostilian to co-emperor and his own son, Volusianus, to caesar. Hostilian died soon after, either due to plague or being murdered by Trebonianus Gallus.

Gaius Vibius Volusianus (Latin: Gaius Vibius Afinius Gallus Veldumnianus Volusianus; died August 253), commonly called Volusian, was a Roman emperor from 251 to 253, ruling with his father Trebonianus Gallus.

Numerian (; died November 284) was Roman emperor from 283 to 284 with his older brother Carinus. They were sons of Carus, a general raised to the office of praetorian prefect under Emperor Probus in 282.

Roman emperor (220-251)

Publius Licinius Cornelius Saloninus Valerianus (died 260), typically just called Saloninus, was a young Roman nobleman who briefly became emperor in 260. The grandson of Valerian I, Saloninus was appointed caesar (heir) in 258 in an attempt to shore up the Licinian line of succession during the Crisis of the Third Century. During his time in power, Saloninus administered the German marches out of Cologne. Nevertheless, Saloninus soon became embroiled in a dispute with future Gallic emperor Postumus over war spoils. In 260, Saloninus' troops acclaimed him augustus (emperor) in an unsuccessful

consul of the Roman Empire (237-249)

Silbannacus was an obscure Roman emperor or usurper during the Crisis of the Third Century. Silbannacus is not mentioned in any contemporary documents and his existence was forgotten until the 20th century, when two coins bearing his name were discovered, the first in the 1930s and the second in the 1980s. His unusual name suggests that he might have been of Gallic descent.