The Tetrarchy
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The Roman Tetrarchy was a bold, experimental "rule of four" established by Emperor Diocletian in 293 AD. Designed to pull the Roman Empire out of the chaotic Third Century Crisis, it replaced the volatile system of single-emperor rule with a structured administrative college. The Power StructureDiocletian realized the Empire had become too vast and threatened for one man to manage. He divided the realm into East and West, appointing a senior emperor, or Augustus, for each half. To ensure a smooth succession—a perennial Roman problem—each Augustus then appointed a junior emperor, or Caesar, who would serve as an apprentice and eventual successor. Stability and SymbolsThe Tetrarchy wasn't just about geography; it was about ideological unity. In art and propaganda, the four rulers were often depicted as identical, huddled in an embrace to project an image of "unconquerable harmony" (concordia). This system allowed the government to respond simultaneously to multiple frontier threats, such as the Persians in the East and Germanic tribes on the Rhine. The CollapseWhile the system functioned under Diocletian’s iron will, it lacked deep-rooted legitimacy. Following his unprecedented voluntary retirement in 305 CE, the Tetrarchy quickly dissolved into civil war. Ambition proved stronger than the formula; the sons of the rulers refused to be bypassed, eventually leading to the rise of Constantine the Great, who dismantled the system to become the sole ruler once more. |
Diocletian
| GAIUS AVRELIVS VALERIVS DIOCLETIANVS was born in 240 in Dalmatia. He became Augustus after the murder of Numerian in October, 284, and he overcame Carinus at Margum to become sole Augustus in July, 285. In 286 he made Maximian co-Augustus ruling over the west (Diocletian took the east), and in 293 instituted the tetrarchic system, choosing as Caesars Constantius I and Galerius. He began to greatly persecute Christians in 303. He abdicated on May 1, 305 and retired to Dalmatia. He reformed the provincial administration, the coinage, and the army. He died of natural causes in 312 or 313 |
Maximian
| MARCVS AVRELIVS VALERIVS MAXIMIANVS was born about 250 in Pannonia. He was appointed Caesar by Diocletian in late 285, and co-Augustus by him in April, 286. Maximian effectively ruled the west, while Diocletian ruled in the east. He was finally forced by Diocletian to abdicate when Diocletian did (May, 305), but when his son Maxentius declared himself Augustus in October, 306, Maximian came out of retirement. He was again forced to retire by the Council of Carnuntum in 308, but he rebelled against his son-in-law Constantine I and either committed suicide or was murdered at Marseilles in 310. |
Galerius
| GAIVS GALERIVS VALERIVS MAXIMIANUS was born about 250 in Moesia Superior. He became Caesar in the east in 293 when Diocletian established the tetrarchy. His major military feat was the defeat of the Sassanians in 298. He was an aggressive persecutor of the Christians, starting as early as 298. In 303 he was the instigator of the "Great" persecution, which only increased in fury when he succeeded Diocletian as Augustus in May, 305. He struggled to preserve the tetrarchic system against chaos. He became ill in the summer of 310, and ended the persecution on April 30, before his death on May 5, 311 |
Galeria Valeria wife of Galerius
| GALERIA VALERIA was the daughter of Diocletian and Prisca. She married Galerius in 293 when he became Caesar under Diocletian. She accompanied Galerius on his Sassanian campaign of 296-298. She became Augusta in 308, three years after Galerius became Augustus. When Galerius died in May, 311, she was entrusted to Licinius I, but fled to Maximinus II. He proposed marriage, but exiled her to Syria when she refused. At his death in 313, she was condemned by Licinius as a threat. She fled and wandered with Prisca for 15 months before they were caught and beheaded at Thessalonica in 315. |
Severus II
| FLAVIVS VALERIVS SEVERVS was an Illyrian of humble birth who was a friend of Galerius. When Maximian abdicated on May 1, 305, he appointed his Caesar Constantius I to be the new Augustus, and at Galerius' urging, Severus II was appointed to be the western Caesar. In 306 when Constantius died, Severus II became Augustus and Constantius' son, Constantine I, became Caesar. Maximian's son, Maxentius, had been twice ignored, and in October 306 he simply proclaimed himself Augustus at Rome. Severus II invaded Italy, but was captured at Ravenna and executed at Rome before the end of 307. |
Maximinus II Daia or Daza
| GAIVS GALERIVS VALERIVS MAXIMINVS was born in Illyricum about 270 to a sister of Galerius. When Diocletian abdicated on May 1, 305 in favor of Galerius, Maximinus became a Caesar. He was given the title of 'Filius Augustorum' after the Conference of Carnuntum in 308. In early 310 his troops hailed him as Augustus. Galerius died in 311, and Licinius and Maximinus became rivals for his territory. Maximinus peacefully gained Asia Minor, but war was inevitable. They fought at Tzirallum in Thrace on April 30, 313 and Maximinus was beaten badly. He escaped but committed suicide at Tarsus a few months later. |
Maxentius
| MARCVS AVRELIVS VALERIVS MAXENTIVS was born to Eutropia and Maximian in 283. He was twice passed over for the throne, but gained power by staging a coup at Rome in October, 306. His sister Fausta married Constantine I and gained an alliance. However he was declared a public enemy at the Conference of Carnuntum in November, 308. His relations with Constantine deteriorated, especially after Maximian tried to overthrow Constantine in 310. Constantine finally invaded Italy in 312 and met Maxentius at the Battle of the Milvian Bridge, where Maxentius was accidentally drowned in the Tiber. |
Licinius I
| VALERIVS LICINIVS LICINIANVS was born in Moesia Superior about 260 to peasants. He was a military friend of Galerius, who had him named Augustus at the Conference of Carnuntum in 308. Licinius formed an alliance with Constantine I, which provoked Maximinus II to attack in 313, an action which ended with Maximinus' suicide. Licinius fell out with Constantine, which resulted in two civil wars. The first, in 316-317, resulted only in territorial loss for Licinius. The second, in 324, resulted in his defeat and capture. He was executed in the spring of 325 on charges of renewed plotting against Constantine. |
Licinius II
| FLAVIVS VALERIVS CONSTANTINVS LICINIANVS LICINIVS was born in 314 to Constantia, the half-sister of Constantine I, and the Emperor Licinius I, who were married in January, 313 at Mediolanum (Milan). Constantine and Licinius I engaged in the First Civil War in 316, one result of which was the agreement to create their sons 'Caesar', and Licinius II was made Caesar on March 1, 317. After the Second Civil War in 324, Licinius II was taken prisoner and held until 326, when he was executed, possibly at the prompting of Fausta, who wanted to eliminate any threat to her sons by Constantine. |
Constantius I Chlorus
| FLAVIVS VALERIVS CONSTANTIVS, the father of Constantine the Great, was born about 250 in Moesia Superior. He served as governor of Dardania before becoming the Praetorian Praefect of Maximian in 288. In 293 he was selected to become 'Caesar' under Maximian in the tetrarchy formed by Diocletian. His first task was to re-conquer Britain, which had seceded under Carausius, and by 296 that task was done. He then moved to Trier and maintained order along the Rhine. He become Augustus in 305 when Maximian abdicated. He moved to repel the Picts in Britain, but fell ill and died at York on July 25, 306 |
