The Battle of Adrianopolis (378) led to a victory for the Goths and the death of Emperor Valens.The Goths were admitted to the territory by him as ‘ Foederati ‘, but were deceived by his regional governors.
Historians said in the mid-20th century that this was the beginning of the end for the Western Roman Empire (although it was an emperor of the East who was defeated) and that the dominance of the Roman legions passed to the Medieval Knights (cavalry About infantry), but as far as I know, that vision is outdated: the Byzantine Empire would have existed for more than 1000 years, and the medieval armies would only get real shape later.
The Battle of Edessa (260) under Emperor Valerianus against the Persians is generally regarded as a greater defeat for the Roman Empire as well as the earlier battle of Varus in the Teutoburg Forest (9 AD).
Already in his own time, Ammianus talked about Adrianopolis as the greatest defeat since the lost battles at Cannae and Carrhae at the time of the Roman Republic.
Despite the loss during the battle, the Romans managed to keep the gutters relatively enclosed in the Balkans (the Goths also had little experience with sieges of fortified cities, which severely hindered their success after the battle).The loss of an emperor was problematic (and did not happen often as a result of a battle, usually it was because of murder or illness), as well as the loss of a field army full of experienced soldiers and officers, but the Romans have often had major defeats ago Part of their strength compared to many historical counterparts was precisely their perseverance after loss, so the battle itself is not so disastrous, and did not result in the loss of a large lap area as some of their losses against the Persians by the Centuries.
What, to my understanding, was the main consequence of Adrianopolis, was that when peace was closed the Goths as Foederati (a special status as a kind of ally/national, who had to supply soldiers for the Roman army) countries And as an autonomous, distinguished group remained within the Empire.Previously, immigrating groups were disarmed and dispersed, and Gothic communities existed throughout the Empire (after Adrianopolis these, civilians and soldiers, were widely killed in the border provinces on orders of Julius, Magister Militum of the east, because he feared that they could join the Goths and make the crisis bigger).The fact that this spreading did not happen at the Goths that were left just before Adrianopolis the Danube is crucial.
The Gothic groups that entered the Roman Empire would in the century followed consistently take a role as an independent player, sometimes as an ally of one Roman faction against the other (e.g. at the Battle of the Frigidus, 394), against other barbarians ( e.g. against the Huns, and when the Visigoths were deployed to regain control of Spain for the Romans at the beginning of the 5th century) other times against the Romans (Rome in 410 of course, and a dozen other examples).The last century of the West-Romeine empire was a constantly out-of-control downward spiral, where an increasingly thinner imperial power of fire fired to fire and Foederati as the Goths and Franks applied for lack of own power, and The Goths traveled as a loving kingdom throughout the West until they arrived in Spain, under the appearances under Roman control because they were nominally Foederati .