Eventually the Visigoths were settled in southern Gaul as foederati of the Romans, the reasons for which are still subjects for debate among scholars. They soon fell out with their hosts and established their own kingdom with its capital at Toulouse. They slowly extended their authority into Hispania, displacing the Vandals and Alans. Their rule in Gaul was cut short in 507 at the Battle of Vouillé, when they were defeated by the Franks under Clovis I. Thereafter the only territory north of the Pyrenees that the Visigoths held was Septimania and their kingdom was limited to Hispania, which came completely under the control of their small governing elite, at the expense of the Byzantine province of Spania and the Suebic Kingdom of Galicia.
In or around 589, the Visigoths, under Reccared I, formerly Arian Christians, converted to the Nicene faith. In their kingdom, the century that followed was dominated by the Councils of Toledo and the episcopacy. Historical sources for the seventh century are relatively sparse. In 711 or 712 the Visigoths, including their king and many of their leading men, were killed in the Battle of Guadalete by a force of invading Arabs and Berbers. The kingdom quickly collapsed thereafter, a phenomenon which has led to much debate among scholars concerning its causes. Gothic identity survived the fall of the kingdom, however, especially in the Kingdom of Asturias and the Marca Hispanica, but the "Visigoths" as a people disappeared.
Of what remains of the Visigoths in Spain and Portugal there are several churches and an increasing number of archaeological finds, but most notably a large number of Spanish, Portuguese, and other Romance language given names and surnames. The Visigoths were the only people to found new cities in western Europe after the fall of the Roman Empire and before the rise of the Carolingians. Until the Late Middle Ages, the greatest Visigothic legacy, which is no longer in use, was their law code, the Liber iudiciorum, which formed the basis for legal procedure in most of Christian Iberia for centuries after their kingdom's demise.
According to Wolfram, in the Notitia Dignitatum the Vesi are equated with the Tervingi in a reference to the years 388–391; this is not clear from the Notitia itself. The Greuthungi are first named by Ammianus Marcellinus, writing no earlier than 392 and perhaps later than 395, and basing his account of the words of a Tervingian chieftain who is attested as early as 376. The Ostrogoths are first named in a document dated September 392 from Milan. Claudian mentions that they together with the Gruthungi inhabit Phrygia. According to Herwig Wolfram, the primary sources either use the terminology of Tervingi/Greuthungi or Vesi/Ostrogothi and never mix the pairs. All four names were used together, but the pairing was always preserved, as in Gruthungi, Austrogothi, Tervingi, Visi. That the Tervingi were the Vesi/Visigothi and the Greuthungi the Ostrogothi is also supported by Jordanes. He identified the Visigothic kings from Alaric I to Alaric II as the heirs of the fourth-century Tervingian king Athanaric and the Ostrogothic kings from Theodoric the Great to Theodahad as the heirs of the Greuthungian king Ermanaric. This interpretation, however, though very common among scholars today, is not universal.
Herwig Wolfram concludes that the terms Tervingi and Greuthungi were geographical identifiers used by each tribe to describe the other. This terminology therefore dropped out of use after the Goths were displaced by the Hunnic invasions. In support of this, Wolfram cites Zosimus as referring to a group of "Scythians" north of the Danube who were called "Greutungi" by the barbarians north of the Ister. Wolfram concludes that this people was the Tervingi who had remained behind after the Hunnic conquest. He further believes that the terms "Vesi" and "Ostrogothi" were used by the peoples to boastfully describe themselves.
The nomenclature of Greuthungi and Tervingi fell out of use shortly after 400. In general, the terminology of a divided Gothic people disappeared gradually after they entered the Roman Empire. The last indication that the Goths whose king reigned at Toulouse considered themselves Vesi is found in a panegyric on Avitus by Sidonius Apollinaris dated 1 January 456. The term "Visigoth", however, was an invention of the sixth century. Most recent scholars (notably Peter Heather) argue that Visigothic group identity emerged only within the Roman Empire. Roger Collins believes the Visigoths were a creation of the Gothic War of 376-382 and began as a collection of foederati (Wolfram's "federate armies") under Alaric I in the eastern Balkans, composed of largely Tervingi with Greuthungian and other barbarian contingents. They were thus multiethnic and cannot lay claim to an exclusively Tervingian heritage. Collins points out that no contemporaries directly link the Tervingi and Vesi.
Cassiodorus, a Roman in the service of Theodoric the Great, invented the term "Visigothi" to match that of "Ostrogothi", which terms he thought of as "western Goths" and "eastern Goths" respectively. The western-eastern division was a simplification and a literary device of sixth-century historians where political realities were more complex. Furthermore, Cassiodorus used the term "Goths" to refer only to the Ostrogoths, whom he served, and reserved the geographical term "Visigoths" for the Gallo-Spanish Goths. This usage, however, was adopted by the Visigoths themselves in their communications with the Byzantine Empire and was in use in the seventh century.
Other names for the Goths abounded. A "Germanic" Byzantine or Italian author referred to one of the two peoples as the Valagothi, meaning "Roman Goths" and in 469 the Visigoths were called the "Alaric Goths".
The Visigoths are called Wesi or Wisi by Trebellius Pollio, Claudian, and Sidonius Apollinaris. The words are Gothic ones meaning "the good or noble people", similar to Gothic iusiza, "better". W. H. Stevenson remarks that the term seems to be the Germanic representative of Indo-European *wesu-s ("good"), comparing Sanskrit vásu-ş and Gaulish vesu-. While Jordanes refers to a river which gave its name to the Vesi, this is probably just legend, like his similar story about the Greuthung name. The name "Visigothi" is an invention of Cassiodorus, who combined "Visi" and "Gothi" and intended to mean "west Goths".
The Battle of Adrianople in 378 was the decisive moment of the war. The Roman forces were slaughtered and the Emperor Valens was killed during the fighting. Adrianople shocked the Roman world and eventually forced the Romans to negotiate with and settle the barbarians within the empire's boundaries, a development with far reaching consequences for the eventual fall of Rome.
Over the next 15 years, years of uneasy peace were broken by occasional conflicts between Alaric and the powerful German generals who commanded the Roman armies in the east and west, wielding the real power of the empire. Finally, after the western general Stilicho was executed by Honorius in 408 and the Roman legions massacred the families of 30,000 barbarian soldiers serving in the Roman army, Alaric declared war. After two defeats in Northern Italy and a siege of Rome ended by a negotiated pay-off, Alaric was cheated by another Roman faction. He resolved to cut the city off by capturing its port. On August 24, 410, however, Alaric's troops entered Rome through the Salarian Gate, to plunder its riches in the sack of Rome. While Rome was no longer the official capital of the Western Roman Empire (it had been moved to Ravenna for strategic reasons), its fall severely shook the empire's foundations.
The Visigothic Kingdom was a Western European power in the 5th to 7th centuries, created in Gaul by the German people of the Visigoths when the Romans lost their control of their empire. In 409 the Vandals, with the allied Alans and Germanic tribes like the Suevi, swept into the Iberian peninsula. In response to this invasion of Roman Hispania, Honorius, the emperor in the West, enlisted the aid of the Visigoths to regain control of the territory. In 418, Honorius rewarded his Visigothic federates by giving them land in Gallia Aquitania on which to settle. This was probably done under hospitalitas, the rules for billeting army soldiers (Heather 1996, Sivan 1987). The settlement formed the nucleus of the future Visigothic kingdom that would eventually expand across the Pyrenees and onto the Iberian peninsula.
The Visigoths' second great king, Euric, unified the various quarreling factions among the Visigoths and, in 475, forced the Roman government to grant them full independence. At his death, the Visigoths were the most powerful of the successor states to the Western Roman Empire.
The Visigoths also became the dominant power in the Iberian Peninsula, quickly crushing the Alans and forcing the Vandals into north Africa. By 500, the Visigothic Kingdom, centred at Toulouse, controlled Aquitania and Gallia Narbonensis and most of Hispania with the exception of the Suevic kingdom in the northwest and small areas controlled by the Basques and Cantabrians. However, in 507, the Franks under Clovis I defeated the Visigoths in the Vouillé and wrested control of Aquitaine. King Alaric II was killed in battle.
After Alaric's death, Visigothic nobles spirited his heir, the child-king Amalaric, first to Narbonne, which was the last Gothic outpost in Gaul, and further across the Pyrenees into Hispania. The center of Visigothic rule shifted first to Barcelona, then inland and south to Toledo. From 511 to 526, the Visigoths were ruled by Theodoric the Great of the Ostrogoths as de jure regent for the young Amalaric.
In 554, Granada and southernmost Hispania Baetica were lost to representatives of the Byzantine Empire (to form the province of Spania) who had been invited in to help settle a Visigothic dynastic struggle, but who stayed on, as a hoped-for spearhead to a "Reconquest" of the far west envisaged by emperor Justinian I.
The last Arian Visigothic king, Liuvigild, conquered the Suevic kingdom in 585 and most of the northern regions (Cantabria) in 574 and regained part of the southern areas lost to the Byzantines, which King Suintila reconquered completely in 624. The kingdom survived until 711, when King Roderic (Rodrigo) was killed while opposing an invasion from the south by the Umayyad Muslims in the Battle of Guadalete on July 19. This marked the beginning of the Muslim conquest of Hispania in which most of peninsula came under Islamic rule by 718.
A Visigothic nobleman, Pelayo, is credited with beginning the Christian Reconquista of Iberia in 718, when he defeated the Umayyads in battle and established the Kingdom of Asturias in the northern part of the peninsula. Other Visigoths, refusing to adopt the Muslim faith or live under their rule, fled north to the kingdom of the Franks, and Visigoths played key roles in the empire of Charlemagne a few generations later.
During their long reign in Spain, the Visigoths were responsible for the only new cities founded in Western Europe between the fifth and eighth centuries. It is certain (through contemporary Spanish accounts) that they founded four: Reccopolis, Victoriacum, Luceo, and Olite. There is also a possible fifth city ascribed to them by a later Arabic source: Baiyara (perhaps modern Montoro). All of these cities were founded for military purposes and three of them in celebration of victory.
There was a religious gulf between the Visigoths, who had for a long time adhered to Arianism, and their Catholic subjects in Hispania. The Iberian Visigoths continued to be Arians until 589. For the role of Arianism in Visigothic kingship, see the entry for Liuvigild.
There were also deep sectarian splits among the Catholic population of the peninsula. The ascetic Priscillian of Avila was martyred by orthodox Catholic forces in 385, before the Visigothic period, and the persecution continued in subsequent generations as "Priscillianist" heretics were rooted out. At the very beginning of Leo I's pontificate, in the years 444-447, Turribius, bishop of Astorga in León, sent to Rome a memorandum warning that Priscillianism was by no means dead, reporting that it numbered even bishops among its supporters, and asking the aid of the Roman See. The distance was insurmountable in the 5th century. Nevertheless Leo intervened, by forwarding a set of propositions that each bishop was required to sign: all did. But if Priscillianist bishops hesitated to be barred from their sees, a passionately concerned segment of Christian communities in Iberia were disaffected from the more orthodox hierarchy and welcomed the tolerant Arian Visigoths. The Visigoths scorned to interfere among Catholics but were interested in decorum and public order.
In 589, King Reccared (Recaredo) converted his people to Catholicism. With the Catholicization of the Visigothic kings, the Catholic bishops increased in power, until, at the Fourth Council of Toledo in 633, they took upon themselves the nobles' right to select a king from among the royal family. Visigothic persecution of Jews began after the conversion to Catholicism of the Visigothic king Reccared. In 633 the same synod of Catholic bishops that usurped the Visigothic nobles' right to confirm the election of a king declared that all Jews must be baptised.