Roman emperor

Titus Caesar Vespasianus (/ˈtaɪtəs/ TY-təs; 30 December 39 – 13 September 81 AD) was Roman emperor from 79 to 81 AD. A member of the Flavian dynasty, Titus succeeded his father Vespasian upon his death, becoming the first Roman emperor ever to succeed his biological father.

Before becoming emperor, Titus gained renown as a military commander, serving under his father in Judea during the First Jewish–Roman War. The campaign came to a brief halt with the death of emperor Nero in 68 AD, launching Vespasian's bid for the imperial power during the Year of the Four Emperors. When Vespasian was declared Emperor on 1 July 69 AD, Titus was left in charge of ending the Jewish rebellion. In 70 AD, he besieged and captured Jerusalem, and destroyed the city and the Second Temple. For this achievement Titus was awarded a triumph; the Arch of Titus commemorates his victory and still stands today.

Eusebius of Caesarea (c. AD 260/265 – 30 May AD 339), also known as Eusebius Pamphilius, was a historian of Christianity, exegete, and Christian polemicist from the Roman province of Syria Palaestina. In about AD 314 he became the bishop of Caesarea Maritima.

Together with Pamphilus, Eusebius was a scholar of the biblical canon and is regarded as one of the most learned Christians during late antiquity. He wrote the Demonstrations of the Gospel, Preparations for the Gospel and On Discrepancies between the Gospels, studies of the biblical text. His work Onomasticon is an early geographical lexicon of places in the Holy Land mentioned in the Bible. As "Father of Church History" (not to be confused with the title of Church Father), he produced the Ecclesiastical History, On the Life of Pamphilus, the Chronicle and On the Martyrs. He also produced a biographical work on Constantine the Great, the first Christian Roman emperor, who was Augustus between AD 306 and AD 337.

The 1st century BC, also known as the last century BC and the last century BCE, started on the first day of 100 BC and ended on the last day of 1 BC. The AD/BC notation does not use a year zero; however, astronomical year numbering does use a zero, as well as a minus sign, so "2 BC" is equal to "year –1". 1st century AD (Anno Domini) follows.

In the course of the century, all the remaining independent lands surrounding the Mediterranean Sea were steadily brought under Roman control, being ruled either directly under governors or through puppet kings appointed by Rome. The Roman state itself was plunged into civil war several times, finally resulting in the marginalization of its 500-year-old Roman Republic, and the embodiment of total state power in a single man—the Roman emperor.

The Valentinian dynasty, commonly known as the Valentinianic 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 (r. 306–363) and reigned over the Roman Empire from 364 to 392 and from 425 to 455, with an interregnum (392–425), 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.

The Valentinian dynasty's patriarch was Gratianus Funarius, whose sons Valentinian I and Valens were both made Roman emperors in 364. Valentinian I's two sons, Gratian and Valentinian II both became emperors. Valentinian I's daughter Galla married Theodosius the Great, the emperor of the eastern empire, who with his descendants formed the Theodosian dynasty (r. 379–457). In turn, their daughter, Galla Placidia married a later emperor, Constantius III (r. 421–421). Their son, Valentinian III (r. 425–455), who ruled in the west, was the last emperor of the dynasty, whose death marked the end of dynasties in the western empire. During the interregnum, Theodosius' son Honorius ruled in the west, and concurrently with Constantius III in 421. The dynasty has been labelled as Pannonian, based on the family origin in Pannonia Secunda in the western Balkans.

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 (r. 364–455), and was succeeded by the Leonid dynasty (r. 457–518) with the accession of Leo the Great.
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Publius Helvius Pertinax (/ˈpɜːrtɪnæks/ PER-tin-ax; 1 August 126 – 28 March 193) was Roman emperor for the first three months of 193. He succeeded Commodus and became the first ruler of the turbulent Year of the Five Emperors.

The son of a freedman, Pertinax rose from modest origins through a military career. He distinguished himself in the Roman–Parthian War of 161–166 and went on to hold a succession of governorships and senior commands. He also sat in the Roman Senate, where he was a contemporary of the historian Cassius Dio.

The Year of the Five Emperors was AD 193, in which five men claimed the title of Roman emperor: Pertinax, Didius Julianus, Pescennius Niger, Clodius Albinus, and Septimius Severus. This year started a period of civil war when multiple rulers vied for the chance to become emperor.

The political unrest began with the murder of Emperor Commodus on New Year's Eve 192. Once Commodus was assassinated, Pertinax was named emperor, but immediately aroused opposition in the Praetorian Guard when he attempted to initiate reforms. They then plotted his assassination, and Pertinax was killed while trying to reason with the mutineers. He had only been emperor for three months. Didius Julianus, who purchased the title from the Praetorian Guard, succeeded Pertinax, but was ousted by Septimius Severus and executed on 1 June. Severus was declared Caesar by the Senate, but Pescennius Niger was hostile so he declared himself emperor.

Marcus Didius Julianus (/ˈdɪdiəs/; 29 January 133 – 2 June 193) was Roman emperor from March to June 193, during the Year of the Five Emperors. Julianus had a promising political career, governing several provinces, including Dalmatia and Germania Inferior, and defeated the Chauci and Chatti, two invading Germanic tribes. He was even appointed to the consulship in 175 along with Pertinax as a reward, before being demoted by Commodus. After this demotion, his early, promising political career languished.

Julianus ascended the throne after buying it from the Praetorian Guard, who had assassinated his predecessor Pertinax. A civil war ensued in which three rival generals laid claim to the imperial throne. Septimius Severus, commander of the legions in Pannonia and the nearest of the generals to Rome, marched on the capital, gathering support along the way and routing cohorts of the Praetorian Guard Julianus sent to meet him. Abandoned by the Senate and the Praetorian Guard, Julianus was killed by a soldier in the palace and succeeded by Severus.

Decimus Clodius Albinus (c. 150 – 19 February 197) was a Roman imperial pretender between 193 and 197. He was proclaimed emperor by the legions in Britain and Hispania after the murder of Pertinax in 193 (known as the "Year of the Five Emperors"). Initially Albinus cooperated with another contender for the throne, Septimius Severus, but the two turned on each other in 196 and commenced a civil war. Albinus died in battle the following year.

The Battle of Lugdunum, also called the Battle of Lyon, was fought on 19 February 197 at Lugdunum (modern Lyon, France), between the armies of the Roman emperor Septimius Severus and of the Roman usurper Clodius Albinus. Severus' victory finally established him as the sole emperor of the Roman Empire following the Year of the Five Emperors and immediate aftermath.

This battle is said to be the largest, most hard-fought, and bloodiest of all clashes between Roman forces. According to English historian Edward Gibbon, the Roman historian Cassius Dio placed the total number of Roman soldiers engaged for both sides combined at 150,000. Historian Michael Kulikowski states that Severus led the much larger force with the combined legions of Dacia and the Danubian provinces. Historian A. J. Graham supports Gibbon's number of 150,000 soldiers in total, rather than the sometimes cited number of 300,000 in total and therefore 150,000 on each side, which he states to be a commonly accepted mistranslation of Cassius Dio's original language. Graham also analyses the possible forces available to Albinus and states that the numbers on each side could have been roughly equal.