[Edit] Divided Goths: Greuthungi and Ostrogothi

The division of the Goths is first attested in 291.^[1] The Tervingi are first attested around that date, the Greuthungi, Vesi, and Ostrogothi are all attested no earlier than 388.^[1] 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.^[1] The Ostrogoths are first named in a document dated September 392 from Milan.^[1] Claudian mentions that they together with the Gruthungi inhabit Phrygia.^[2] According to Herwig Wolfram, the primary sources either use the terminology of Tervingi/Greuthungi or Vesi/Ostrogothi and never mix the pairs.^[1] All four names were used together, but the pairing was always preserved, as in Gruthungi, Austrogothi, Tervingi, Visi.^[3] That the Tervingi were the Vesi/Visigothi and the Greuthungi the Ostrogothi is also supported by Jordanes.^[4] 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. According to the Jordanes' Getica, around 400 the Ostrogoths were ruled by Ostrogotha and derived their name from this "father of the Ostrogoths", but modern historians often assume the converse, that Ostrogotha was named after the people.^[1]

Both Herwig Wolfram and Thomas Burns conclude that the terms Tervingi and Greuthungi were geographical identifiers used by each tribe to describe the other.^[3][5] 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 "Greuthungi" by the barbarians north of the Ister.^[6] Wolfram concludes that this people was the Tervingi who had remained behind after the Hunnic conquest.^[6] He further believes that the terms "Vesi" and "Ostrogothi" were used by the peoples to boastfully describe themselves.^[3] On this understanding, the Greuthungi and Ostrogothi were more or less the same people.^[5]

The nomenclature of Greuthungi and Tervingi fell out of use shortly after 400.^[1] In general, the terminology of a divided Gothic people disappeared gradually after they entered the Roman Empire.^[3] The term "Visigoth", however, was an invention of the sixth century. 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.^[3] The western-eastern division was a simplification and a literary device of sixth-century historians where political realities were more complex.^[7] 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.^[7]

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".^[7] In 484 the Ostrogoths had been called the Valameriaci (men of Valamir) because they followed Theodoric, a descendant of Valamir.^[7] This terminology survived in the Byzantine East as late as the reign of Athalaric, who was called του Ουαλεμεριακου (tou Oualemeriakou) by John Malalas.^[8]