Theodosius I, also called Theodosius the Great, was Roman emperor from 379 to 395. During his reign, he succeeded in a crucial war against the Goths, as well as in two civil wars, and was instrumental in establishing the creed of Nicaea as the orthodox doctrine for Christianity. Theodosius was the last emperor to rule the entire Roman Empire before its administration was permanently split between the West and East.
Valens was Roman emperor from 364 to 378. Following a largely unremarkable military career, he was named co-emperor by his elder brother Valentinian I, who gave him the eastern half of the Roman Empire to rule. In 378, Valens was defeated and killed at the Battle of Adrianople against the invading Goths, which astonished contemporaries and marked the beginning of barbarian encroachment into Roman territory.
Gratian was emperor of the Western Roman Empire from 367 to 383. The eldest son of Valentinian I, Gratian was raised to the rank of Augustus as a child and inherited the West after his father's death in 375. He nominally shared the government with his infant half-brother Valentinian II, who was also acclaimed emperor in Pannonia on Valentinian's death. The East was ruled by his uncle Valens, who was later succeeded by Theodosius I.
Valentinian I, sometimes called Valentinian the Great, was Roman emperor from 364 to 375. He ruled the Western half of the empire, while his brother Valens ruled the East. During his reign, he fought successfully against the Alamanni, Quadi, and Sarmatians, strengthening the border fortifications and conducting campaigns across the Rhine and Danube. His general Theodosius defeated a revolt in Africa and the Great Conspiracy, a coordinated assault on Roman Britain by Picts, Scoti, and Saxons. Valentinian founded the Valentinianic dynasty, with his sons Gratian and Valentinian II succeeding him in the western half of the empire.
Valentinian II was a Roman emperor in the western part of the Roman empire between AD 375 and 392. He was at first junior co-ruler of his half-brother, was then sidelined by a usurper, and only after 388 sole ruler, albeit with limited de facto powers.
Jovian was Roman emperor from June 363 to February 364. As part of the imperial bodyguard, he accompanied Emperor Julian on his campaign against the Sasanian Empire. Julian was killed in battle, and the exhausted and ill-provisioned army declared Jovian his successor. Unable to cross the Tigris, Jovian extricated his troops from enemy territory by making peace with the Sasanids on humiliating terms. He spent the rest of his eight-month reign traveling back to Constantinople. After his arrival at Edessa, Jovian was petitioned by bishops over doctrinal issues concerning Christianity. He died at Dadastana, never having reached the capital.
Flavius Theodosius, also known as Count Theodosius or Theodosius the Elder, was a senior military officer serving Valentinian I and the western Roman empire during Late Antiquity. Under his command the Roman army defeated numerous threats, incursions, and usurpations. Theodosius was patriarch of the imperial Theodosian dynasty and father of the emperor Theodosius the Great.
Procopius was a Roman usurper against Valens.
The Theodosian dynasty was a Roman imperial family that produced five Roman emperors during Late Antiquity, reigning over the Roman Empire from 379 to 457. The dynasty's patriarch was Theodosius the Elder, whose son Theodosius the Great was made Roman emperor in 379. Theodosius's two sons both became emperors, while his daughter married Constantius III, producing a daughter that became an empress and a son also became emperor. The dynasty of Theodosius married into, and reigned concurrently with, the ruling Valentinianic dynasty, and was succeeded by the Leonid dynasty with the accession of Leo the Great.
The Valentinianic or Valentinian dynasty was a ruling house of five generations of dynasts, including five Roman emperors during Late Antiquity, lasting nearly a hundred years from the mid fourth to the mid fifth century. They succeeded the Constantinian dynasty and reigned over the Roman Empire from 364 to 392 and from 425 to 455, with an interregnum (392–423), during which the Theodosian dynasty ruled and eventually succeeded them. The Theodosians, who intermarried into the Valentinian house, ruled concurrently in the east after 379.
Justina was a Roman empress. She was initially the wife of the rebel emperor Magnentius and was then married to Valentinian I, with whom she had four children, including the emperor Valentinian II and the empress Galla.
Arbogastes or Arbogast was a Roman army officer of Frankish origin.
Martinian was Roman emperor from July to September 324. He was raised to the purple by the emperor Licinius, whom he had hitherto served as a senior bureaucrat, during Licinius's civil war against the emperor Constantine I. Constantine defeated both emperors and forced them to abdicate, and executed them after initially showing leniency.
Galla was a Roman empress as the second wife of Theodosius I. She was the daughter of Valentinian I and his second wife Justina.
Constantia (362–383) was the first empress consort of Gratian of the Western Roman Empire. According to Ammianus Marcellinus, Constantia was a posthumous child of Constantius II by his third wife Faustina.
Flavius Merobaudes was a Roman army officer of Frankish origin. He was appointed magister peditum around 375, and consul twice in 377 and 383. Ancient sources record that he was put to death that year for his support of the imperial usurper Magnus Maximus, but an inscription records that he became consul a third time in 388.
Flavius Arintheus was a Roman army officer who started his career as a middle-ranking officer and rose to senior political and military positions. He served the emperors Constantius II, Julian, Jovian and Valens. He was appointed consul in 372 alongside Domitius Modestus.
Valentinianus Galates was the only son of the Roman emperor Valens, who ruled the Roman Empire during Late Antiquity. Born into the ruling Valentinianic dynasty, Valentinianus became Roman consul as an infant, but he died in early childhood, and the empire passed to the sons and daughter of Valentinian the Great, Valentinianus Galates's uncle.
Victor was a Roman military officer and politician, who served the emperors Constantius II, Julian, Jovian and Valens. He was appointed consul in AD 369, alongside Valentinianus Galates.
Terentius was an Eastern Roman military commander whose recorded career flourished in the Caucasus region c. 369–374. He served the Roman Emperor Valens as comes rei militaris, most notably in the East.