Gallienus was Roman emperor with his father Valerian from 22 October 253 to spring 260 and alone from spring 260 to September 268. He ruled during the Crisis of the Third Century that nearly caused the collapse of the empire. While he won a number of military victories, he was unable to prevent the secession of important provinces. His 15-year reign was the longest in half a century.
Year 251 (CCLI) was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Traianus and Etruscus. The denomination 251 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 254 (CCLIV) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerianus and Gallienus. The denomination 254 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 257 (CCLVII) was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerianus and Gallienus. The denomination 257 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
The 250s decade ran from January 1, 250, to December 31, 259.
The 260s decade ran from January 1, 260, to December 31, 269.
Year 252 (CCLII) was a leap year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Trebonianus and Volusianus. The denomination 252 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 260 (CCLX) was a leap year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Saecularis and Donatus. The denomination 260 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Year 265 (CCLXV) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerianus and Lucillus. The denomination 265 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
Valerian was Roman emperor from 22 October 253 to spring 260 AD. He was taken captive by the Persian Emperor, Shapur I, after the Battle of Edessa, becoming the first Roman emperor to be captured as a prisoner of war, causing shock and instability throughout the Roman Empire. The unprecedented event and the unknown fate of the captured emperor generated a variety of different reactions and "new narratives about the Roman Empire in diverse contexts".
Pope Cornelius was the bishop of Rome from 6 or 13 March 251 to his martyrdom in June 253. He was pope during and following a period of persecution of the church and a schism occurred over how repentant church members who had practiced pagan sacrifices to protect themselves could be readmitted to the church. Cornelius agreed with Cyprian of Carthage that those who had lapsed could be restored to communion after varying forms of penance. That position was in contrast to the Novationists, who held that those who failed to maintain their confession of faith under persecution would not be received again into communion with the church. That resulted in a schism in the Church of Rome that spread as each side sought to gather support. Cornelius held a synod that confirmed his election and excommunicated Novatian, but the controversy regarding lapsed members continued for years.
Gaius Vibius Trebonianus Gallus was Roman emperor from June 251 to August 253, in a joint rule with his son Volusianus.
Aemilianus, also known as Aemilian, was Roman emperor for three months in 253.
Quintus Herennius Etruscus Messius Decius was Roman emperor in 251, ruling jointly with his father Decius. His father was proclaimed emperor by his troops in September 249 while in Pannonia and Moesia, in opposition to Emperor Philip the Arab. Decius defeated Philip in battle, and was then proclaimed emperor by the Roman Senate. Herennius Etruscus was elevated to caesar in 250, then further raised to augustus in May 251. When the Goths, under Cniva, invaded the Danubian provinces, Herennius Etruscus was sent with a vanguard, followed by the main body of Roman troops, led by Decius. They ambushed Cniva at the Battle of Nicopolis ad Istrum in 250, routing him, before being ambushed and routed themselves at the Battle of Beroe. Herennius Etruscus was killed in the Battle of Abritus the following year, alongside his father. After the deaths of both emperors, Trebonianus Gallus, who had been governor of Moesia, was elected emperor by the remaining Roman forces.
Hostilian was Roman emperor from July to November 251. Hostilian was born to Decius and Herennia Etruscilla at an unknown date and elevated to Caesar in May 251 by Decius, the same month as his older brother, Herennius Etruscus, was raised to co-emperor. After Decius and Herennius Etruscus 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 in November 251, either due to plague or being murdered by Trebonianus Gallus.
Volusianus was a Roman emperor from November 251 to August 253. His father, Trebonianus Gallus, became emperor after being elected in the field by the legion, following the deaths of the previous co-emperors Decius and Herennius Etruscus. Trebonianus Gallus raised Hostilian, the son of Decius, to augustus, making him his co-emperor in June 251. Volusianus was elevated to caesar in the same month. After the death, or murder, of Hostilian in November 251, Volusianus was raised to augustus, co-ruling with his father. The short reign of Trebonianus Gallus and Volusianus was notable for the outbreak of a plague, which is said by some to be the reason for Hostilian's death, the invasion of the Sasanian Empire, and the raids of the Goths. Volusianus was killed alongside his father in August 253 by their own soldiers, who were terrified of the forces of the usurper Aemilian which were marching towards Rome.
The gens Vibia was a plebeian family at ancient Rome. Although individuals named Vibius appear in history during the time of the Second Punic War, no members of this gens are found at Rome until the final century of the Republic. The first of the Vibii to obtain the consulship was Gaius Vibius Pansa in 43 BC, and from then until imperial times the Vibii regularly filled the highest offices of the Roman state. The emperors Trebonianus Gallus and Volusianus each claimed descent from the family.
