Sack of Rome (455) in the context of "Vandalic War"

In the year before the First Council of Constantinople in 381, Nicene Christianity became the official religion of the Roman Empire when Theodosius I, emperor of the East, Gratian, emperor of the West, and Gratian's junior co-ruler Valentinian II issued the Edict of Thessalonica in 380, which recognized the catholic orthodoxy, as defined by the Council of Nicea, as the Roman Empire's state religion. Historians refer to this state-sponsored church using a variety of terms: the catholic church, the orthodox church, the imperial church, the Roman church, or the Byzantine church, with some also used for wider communions extending beyond the Roman Empire. The Eastern Orthodox Church, Oriental Orthodoxy, and the Catholic Church all claim to stand in continuity from the Nicene Christian church to which Theodosius granted recognition. Political differences between the Eastern Roman Empire and the Persian Sassanid Empire led to the separation of the Church of the East in 424. A doctrinal split within the imperial church led to the independence of early Oriental Orthodoxy, while the fall of the Western Roman Empire initiated the gradual separation between Eastern and Western Christianity, culminating in the East-West schism of 1054. The Western Church evolved into the Latin Catholic Church while the Eastern Church that remained under the patronage of the Eastern empire and evolved into the Greek Orthodox Church.

Earlier in the 4th century, following the Diocletianic Persecution of 303–313 and the Donatist controversy that arose in consequence, Constantine the Great had convened councils of bishops to define the orthodoxy of the Christian faith and to expand on earlier Christian councils. A series of ecumenical councils convened by successive Roman emperors met during the 4th and the 5th centuries, but Christianity continued to suffer rifts and schisms surrounding the theological and christological doctrines of Arianism, Nestorianism, Miaphysitism, and Dyophysitism. In the 5th century, the Western Roman Empire decayed as a polity; invaders sacked Rome in 410 and in 455, and Odoacer, an Arian barbarian warlord, forced Romulus Augustus, the last nominal Western Emperor, to abdicate in 476. However, apart from the aforementioned schisms, the church as an institution persisted in communion, if not without tension, between the East and West. In the 6th century, the Byzantine armies of the Byzantine Emperor Justinian I recovered Italy and other regions of the Western Mediterranean shore. The Byzantine Empire soon lost most of these gains, but it held Rome, as part of the Exarchate of Ravenna, until 751, a period known in church history as the Byzantine Papacy. The early Muslim conquests of the 7th–9th centuries would begin a process of converting most of the then-Christian world in the Levant, Middle East, North Africa, regions of Southern Italy and the Iberian Peninsula to Islam, severely restricting the reach both of the Byzantine Empire and of its church. Christian missionary activity directed from the capital of Constantinople did not lead to a lasting expansion of the formal link between the church and the Byzantine emperor, since areas outside the Byzantine Empire's political and military control set up their own distinct churches, as in the case of Bulgaria in 919.

Gaiseric (c. 389 – 25 January 477), also known as Geiseric or Genseric (Latin: Gaisericus, Geisericus; reconstructed Vandalic: *Gaisarīx) was king of the Vandals and Alans from 428 to 477. He ruled over a kingdom and played a key role in the decline of the Western Roman Empire during the 5th century.

The murder of Roman Emperor Valentinian III, who had betrothed his daughter to Gaiseric's son Huneric, led the Vandal king to invade Italy. The invasion culminated in his most famous exploit, the capture and plundering of Rome in June 455. Gaiseric repulsed two major attempts by both halves of the Roman Empire to reclaim North Africa, inflicting devastating defeats on the forces of Majorian in 460 and Basiliscus in 468. As a result, the Romans abandoned their campaign against the Vandals and concluded peace with Gaiseric. Gaiseric died in Carthage in 477 and was succeeded by his son, Huneric. Through his nearly fifty years of rule, Gaiseric raised a relatively inconsequential Germanic tribe to the status of a major Mediterranean power.

Vandalism is the action involving deliberate destruction of or damage to public or private property.

The term includes property damage, such as graffiti and defacement directed towards any property without permission of the owner. The term finds its roots in an Enlightenment view that the Germanic Vandals were a uniquely destructive people, as they sacked Rome in 455 AD.

Eparchius Avitus (died 456/7) was Roman emperor of the Western Empire from July 455 to October 456. He was a senator of Gallic extraction and a high-ranking officer both in the civil and military administration, as well as Bishop of Piacenza.

He opposed the reduction of the Western Roman Empire to Italy alone, both politically and from an administrative point of view. For this reason, as Emperor he introduced several Gallic senators in the Imperial administration; this policy, however, was opposed by the senatorial aristocracy and by the people of Rome, who had suffered from the sack of the city by the Vandals in 455.

Petronius Maximus (c. 397 – 31 May 455) was Roman emperor of the West for two and a half months in 455. A wealthy senator and a prominent aristocrat, he was instrumental in the murders of the Western Roman magister militum, Aëtius, and the Western Roman emperor, Valentinian III.

After the assassination of Aëtius and the subsequent death of Valentinian III, Maximus secured the support of the Senate and utilized bribery to gain the favor of palace officials, enabling him to ascend to power. He strengthened his position by forcing Licinia Eudoxia, Valentinian's widow, to marry him and forcing her daughter Eudocia to marry his son, cancelling her betrothal to the son of the Vandal king Genseric. This infuriated both Eudocia and Genseric, who sent a fleet to Rome. Maximus failed to obtain troops from the Visigoths and he fled as the Vandals arrived, became detached from his retinue and bodyguard in the confusion, and was killed by fellow Romans. The Vandals thoroughly sacked Rome in their retaliatory invasion.