The Vandal Kingdom (Latin: Regnum Vandalum) or Kingdom of the Vandals and Alans (Latin: Regnum Vandalorum et Alanorum) was a confederation of Vandals and Alans, and a barbarian kingdom established under Gaiseric (or Genseric), a Vandalic warlord. It ruled parts of North Africa and the Mediterranean for 99 years from 435 to 534 AD.
In 429 AD, an estimated 80,000 Vandals, using their boats, crossed over from Hispania to North Africa. They advanced eastward, conquering the coastal regions of what is now Tunisia, and Algeria. In 435 AD, the Western Roman Empire, then ruling North Africa, allowed the Vandals to settle in the provinces of Numidia and Mauretania when it became clear that the Vandals could not be defeated through military force. In 439 AD, the Vandals renewed their advance eastward and captured Carthage, the most important city in North Africa. The fledgling kingdom then conquered the Roman-ruled islands of Mallorca, Sicily, Sardinia, and Corsica in the western Mediterranean. In the 460s AD, the Romans launched two unsuccessful military expeditions by sea in an attempt to overthrow the Vandals and reclaim North Africa. The conquest of North Africa by the Vandals was a blow to the beleaguered Western Roman Empire, as North Africa had been a major source of revenue and a supplier of grain, especially wheat, to the city of Rome.
Although primarily remembered for their sack of Rome in 455 AD and the persecution of Nicene Christians in favour of Arian Christianity, the Vandals also supported the continued construction of educational institutions in their kingdom. According to historian Richard Miles, North Africa hosted "many of the most innovative writers and natural scientists" of the late Latin-speaking Western Roman Empire.
The Vandal Kingdom ended in 534 AD, when it was conquered by Belisarius in the Vandalic War and incorporated into the Eastern Roman Empire. The surviving Vandals either assimilated into the indigenous African population or were dispersed among the Byzantine territories.
The Vandals, under their new king Gaiseric (also known as Genseric or Geiseric), crossed to Africa in 429, beginning the Vandalic conquest of Roman Africa. Although their numbers are unknown and some historians debate the validity of estimates, based on Procopius's assertion that the Vandals and Alans numbered 80,000 when they moved to North Africa, Peter Heather estimates that they could have fielded an army of around 15,000–20,000. According to Procopius, the Vandals came to Africa at the request of Bonifacius, the military ruler of the region. However, it has been suggested that the Vandals migrated to Africa in search of safety; they had been attacked by a Roman army in 422 and had failed to seal a treaty with them. Advancing eastward along the African coast, the Vandals laid siege to the walled city of Hippo Regius in 430. Inside, Saint Augustine and his priests prayed for relief from the Arian Christian invaders, knowing that the fall of the city would spell conversion or death for many Nicene Christians. On 28 August 430, three months into the siege, the 75-year-old St. Augustine died — perhaps from starvation or stress, as the wheat fields outside the city lay dormant and unharvested. After 14 months, hunger and disease were ravaging both the city's inhabitants and the Vandals outside the walls. The city eventually fell to the Vandals, who made it their first capital.
Peace was made between the Romans and the Vandals in 435 through a treaty between Valentinian III and Gaiseric, giving the Vandals control of coastal Numidia and parts of Mauretania. Gaiseric chose to break the treaty in 439 when he invaded the province of Africa Proconsularis and laid siege to Carthage. The city was captured without a fight; the Vandals entered it while most of the inhabitants were attending the races at the hippodrome. Gaiseric made it his capital and styled himself the King of the Vandals and Alans, to denote the inclusion of his Alan allies into his realm. Conquering Sicily, Sardinia, Corsica, Malta, and the Balearic Islands, he built his kingdom into a powerful state. Averil Cameron suggests that the new Vandal rule may not have been unwelcome to the population of North Africa, as the previous landowners were generally unpopular.The impression given by sources such as Victor of Vita, Possidius, Quodvultdeus, and Fulgentius of Ruspe was that the Vandal takeover of Carthage and North Africa led to widespread destruction. However, recent archaeological investigations have challenged this assertion. Although Carthage's odeon was destroyed, the street grid remained the same, and some public buildings were renovated. The political centre of Carthage was Byrsa Hill. New industrial centres emerged in towns during this period. Historian Andy Merrills uses the large amounts of African red slip ware discovered across the Mediterranean that date from the Vandal period of North Africa to challenge the assumption that the Vandal rule of North Africa was a time of economic instability. When the Vandals raided Sicily in 440, the Western Roman Empire was too preoccupied with war in Gaul to react. Theodosius II, emperor of the Eastern Roman Empire, dispatched an expedition to deal with the Vandals in 441, but it progressed only as far as Sicily. The Western Empire, under Valentinian III, secured peace with the Vandals in 442. Under the treaty, the Vandals gained Byzacena, Tripolitania, and part of Numidia and confirmed their control of Proconsular Africa.
Historians since Edward Gibbon have seen the capture of North Africa by the Vandals and Alans as the "deathblow" and "the greatest single blow" to the Western Roman Empire in its struggle to survive. Prior to the Vandals, northern Africa was prosperous and peaceful, requiring only a small percentage of the Roman Empire's military forces, and was an important source of taxes for the empire and grain for the city of Rome. The scholar Josephus in the 1st century AD said that North Africa fed Rome for eight months of the year, with the other four months of needed grain coming from Egypt.
The Roman need for grain from North Africa may have declined by the 5th century because the population of the city of Rome had fallen, and the number of Roman soldiers had decreased. The treaty in 442 between Rome and the Vandals seems to have ensured that grain shipments continued. However, in terms of halting hostilities between Rome and the Vandals, that treaty was honored more in the breach than in the observance, and the Romans placed a high priority on recovering North Africa and regaining their control of grain from the Vandal Kingdom.
The peace treaty of 442 did not halt Vandal raids in the western Mediterranean. Over the next 35 years, Gaiseric used his large naval fleet to loot the coasts of both the Eastern and Western Empires. After Attila the Hun's death in 453, however, the Romans turned their attention back to the Vandals, who were now in control of some of the richest lands formerly ruled by Rome.
In an effort to bring the Vandals into the fold of the Empire, Valentinian III offered the hand of his daughter, Eudocia, in marriage to Gaiseric's son Huneric when both Eudocia and Huneric were children. However, they had not yet wed when in 455, Valentinian III was murdered by accomplices of the usurper Petronius Maximus, who sought control of the Empire. Maximus immediately married Valentinian's widow, the Empress Licinia Eudoxia, and he also canceled Eudocia's betrothal to Huneric and married her instead to his own son, Palladius. Diplomacy between Rome and the Vandal Kingdom broke down. Eudoxia wrote a letter to Gaiseric, begging him to come to her aid. Claiming that the broken betrothal between Huneric and Eudocia invalidated his peace treaty with Valentinian, Gaiseric sacked Rome, rescuing Eudoxia, Eudocia, and Eudoxia's younger daughter Placidia (the latter was married to the future unrecognised emperor Olybrius). Maximus and Palladius were killed by an angry mob while fleeing the city.