The Goths were an East Germanic-speaking people who broke a Roman field army at Adrianople in 378, produced the earliest substantially recorded Germanic language, and founded the two largest successor kingdoms of the western Roman world.
The Goths appear on the Roman Danube in the third century as raiders, become federates, and within a century and a half hold the two largest successor states of the western empire — one in Italy, one that ended at Toledo. They matter out of proportion to their numbers for three reasons. They were the first barbarian people to destroy a Roman field army and survive the political consequences. They produced the earliest Germanic language recorded in quantity, which makes them foundational to the study of every Germanic language that followed. And their conversion to Homoian Christianity in the 340s set Arian rulers over Nicene subjects, which was the problem both Gothic kingdoms had to solve or fail.
"The Goths" is best understood as a name people could join rather than a bloodline. The force Alaric led into Italy absorbed Alans, Huns, Roman deserters and escaped slaves; the army Theoderic took into Italy in 489 had been welded together in the Balkans out of two rival Gothic followings plus Rugi and others. Gothic identity was a political and military allegiance carried by a language and a royal tradition, and it changed shape every time its circumstances changed.
The endonym is recoverable from the language itself. A surviving fragment of the Gothic calendar gives Gut-þiuda, "the Gothic people", with gutisk as the adjective. Latin writers used Gothi and Greek writers Gotthoi, so for once the outsiders' word and the insiders' word are close relatives rather than strangers.
The other labels came from outside. Ammianus Marcellinus, the best contemporary witness to the fourth century, writes of Tervingi north of the lower Danube and Greuthungi north of the Black Sea; both names fall out of use after about 400. Vesi or Visi and Ostrogothi appear in fourth-century Latin sources such as the Notitia Dignitatum and the poems of Claudian, but the neat pairing of Visigothi and Ostrogothi as "western" and "eastern" Goths is Cassiodorus' sixth-century arrangement, passed on by Jordanes. The older sense of Ostrogothi was probably "Goths of the rising sun", a poetic epithet rather than a compass bearing.
The oldest puzzle is the Gutones question. Tacitus names Gotones east of the Vistula in the Germania of about 98, Pliny has Gutones and Ptolemy Gythones. The names are plausibly related to the later Gothic one and the Wielbark archaeology sits in roughly the right place, but the equation rests on philology and geography rather than on any source connecting the two populations. "Probably related" is as far as the evidence reaches, and this archive stops there.
Jordanes goes much further, and deliberately. His Getica conflates the Goths with the Getae, a Thracian people described by Herodotus, and with the Scythians. That was not confusion: it handed the Goths a classical pedigree reaching back before Rome and made a Gothic king's ancestors the equals of figures in Greek historiography. Everything he says about deep Gothic antiquity has to be read as that kind of claim.
How much Gothic identity predates the Roman frontier is the live disagreement in the field, and it is worth naming rather than smoothing over. Michael Kulikowski presses hardest that the later Gothic peoples were created inside the empire and that their earlier history as distinct groups is retrojection. Peter Heather allows more continuity, arguing that recognisable cores held together through the crises. Herwig Wolfram's Traditionskern model sits between, proposing a small leading kernel that carried a genuine tradition which others joined. Guy Halsall and Walter Pohl treat ethnicity as situational and political, asserted more strongly at some moments than others. Walter Goffart goes furthest the other way, reading the Getica as essentially a literary product of Justinianic Constantinople.
Later tradition gives a tidy account. Jordanes reports that the Goths left Scandza in three ships under King Berig, landed at a place called Gothiscandza, and moved on to Oium in Scythia. It was written at Constantinople in 551, as an epitome of Cassiodorus' lost Gothic History, for an audience that included Goths in imperial service and Roman aristocrats who might marry them. It is a sixth-century origin legend composed for a Gothic-Roman readership, and it is not a migration record.
Archaeology points in a related but much vaguer direction. The Wielbark culture of the lower Vistula in the first and second centuries and the Chernyakhov, or Sântana de Mureș, culture of the third and fourth between the Danube and the Dnieper share burial practices, brooch types and pottery in ways that indicate real movement of people and material southeast toward the Black Sea. But Chernyakhov is emphatically multi-ethnic: it contains Sarmatian, Dacian and Roman-provincial elements, and its wheel-thrown grey pottery owes more to provincial Roman workshops than to anything northern.
The limit of the evidence is worth stating precisely, because it is routinely overrun. Grave goods carry no ethnic labels. Reading costume and assemblages as national markers was the method associated with Gustaf Kossinna and it has been abandoned; Halsall argues that a furnished grave displays status, gender and family claims at the moment of burial rather than the buried person's sense of who they were. So the honest summary is narrow: the material supports movement of population and styles from the Vistula toward the Pontic steppe, and it does not support a single people migrating intact out of Scandinavia.
Gothic raiding began in the 230s and escalated quickly. In 251 at Abritus a Gothic force under Cniva destroyed a Roman army and killed the emperor Decius, the first Roman emperor to die fighting a foreign enemy. Seaborne raids reached the Aegean, sacking the temple of Artemis at Ephesus and striking Athens in 267 or 268. The counterstroke came at Naissus in 268 or 269, after which Claudius II took the victory title Gothicus.
Rome's abandonment of Dacia under Aurelian in 271 removed the province that had stood between the empire and these groups, and left the Danube as the line. Constantine imposed a treaty in 332 that bound Gothic groups to supply troops and gave them trading access across the frontier. That arrangement is the hinge of the whole third- and fourth-century relationship: it made Gothic society dependent on Roman subsidy and Roman markets.
Dependence cut both ways, and the Romans knew it. Closing the frontier markets was a usable political weapon, which is why the mismanagement of supply in 376 turned a refugee crisis into a war rather than a hardship. Gothic exports were agricultural produce, slaves taken in raiding, and above all military manpower paid for in gold and rations under treaty. Treating this economy as self-sufficient misses the mechanism that bound the two sides together.
The break came from the east. In about 375 the Huns shattered the Greuthungi. Ammianus says their king Ermanaric killed himself; Jordanes supplies instead a story of the Rosomoni and a woman named Sunilda torn apart by horses, a tale that resurfaces centuries later in Norse legend as Jörmunrekkr. What is certain is that the political order north of the Black Sea collapsed within a few years.
In 376 large numbers of Tervingi under Fritigern and Alavivus asked to cross the Danube and were admitted. Ammianus' account of what followed is the crucial passage in the whole story: the Roman officers Lupicinus and Maximus profiteered on the refugees, selling dog meat at the price of a child sold into slavery. The revolt that resulted produced the catastrophe at Adrianople on 9 August 378, where the emperor Valens was killed and, by Ammianus' reckoning, two-thirds of the eastern field army died with him.
The settlement of 382 under Theodosius I is as important as the battle and much less remembered. It placed the survivors inside the empire by treaty, on terms that left them as a recognisable armed community rather than dispersing them among the provinces. Nothing quite like that had been conceded before, and it established the precedent on which every later Gothic negotiation with Roman authority was built.
Fourth-century Gothic politics were not monarchical, and calling their leaders kings obscures what the sources actually describe. The Tervingi were led by a iudex, a judge — Ammianus' term for Athanaric's position — presiding over a league of lesser rulers, the reiks. It was a confederation with a temporary supreme arbiter, not a state with a crown, and its leaders had no machinery for compelling anyone who chose to walk away.
Unified Gothic kingship was made inside the Roman empire, under the pressure of negotiating with it. Alaric's elevation as king in 395, over a following drawn from several groups, is the first durable example. The dynastic lines that later justified such kingship — the Balthi among the Visigoths, the Amals among the Ostrogoths — were given their genealogical depth retrospectively by court writers who needed a Gothic king to look like an ancient one.
Wolfram's formulation is the useful one: the Gothic kingdoms were created by Roman service and by opposition to Rome, not carried out of a northern forest ready-made. The institution that ruled Italy and Hispania was a product of the frontier, not an import across it.