The Kingdom of the Suebi (), also called the Kingdom of Galicia () or Suebi Kingdom of Galicia (), was a Germanic post-Roman kingdom that was one of the first to separate from the Roman Empire. Based in the former Roman provinces of Gallaecia and northern Lusitania, the de facto kingdom was established by the Suebi about 409, and during the 6th century it became a formally declared kingdom identifying with Gallaecia. It maintained its independence until 585, when it was annexed by the Visigoths, and was turned into the sixth province of the Visigothic Kingdom in Hispania.
Origins
Little is known about the Suebi who crossed the Rhine on the night of 31 December 406 AD and entered the Roman Empire. It is speculated that these Suevi are the same group as the Quadi, who are mentioned in early writings as living north of the middle Danube, in what is now lower Austria and western Slovakia, and who played an important part in the Germanic Wars of the 2nd century, when, allied with the Marcomanni, they fought fiercely against the Romans under Marcus Aurelius. The main reason behind the identification of the Suevi and Quadi as the same group comes from a letter written by St. Jerome to Ageruchia, listing the invaders of the 406 crossing into Gaul, in which the Quadi are listed and the Suevi are not. The argument for this theory, however, is based solely on the disappearance of the Quadi in the text and the emergence of the Suevi, which conflicts with the testimony of other contemporary authors, such as Orosius, who did indeed cite the Suevi among the peoples traversing the Rhine in 406, and side by side with Quadi, Marcomanni, Vandals and Sarmatians in another passage. Sixth century authors identified the Sueves of Gallaecia with the Alamanni, or simply with Germans, whilst the 4th century Laterculus Veronensis mentions some Suevi side by side with Alamanni, Quadi, Marcomanni and other Germanic peoples.

Additionally it has been pointed out that the lack of mention of the Suevi could mean that they were not per se an older distinct ethnic group, but the result of a recent ethnogenesis, with many smaller groups—among them part of the Quadi and Marcomanni—coming together during the migration from the Danube valley to the Iberian Peninsula. Other groups of Sueves are mentioned by Jordanes and other historians as residing by the Danube regions during the 5th and 6th centuries.

Although there is no clearly documented reason behind the migration of 405
, a widely accepted theory is that the migration of the various Germanic peoples west of the Rhine was due to the westward push of the Huns during the late 4th century, which forced the Germanic peoples westward in response to the threat. This theory has created controversy within the academic community, because of the lack of convincing evidence.

Whether displaced by the Huns or not, the Suevi along with the Vandals and Alans crossed the Rhine on the night of 31 December 405. Their entrance into the Roman Empire was at a moment when the Roman West was experiencing a series of invasions and civil wars; between 405 and 406, the Western regions of the empire saw the invasion of Italy by Goths under Radagaisus, as well as a steady stream of usurpers. This allowed the invading barbarians to enter Gaul with little resistance, consequently allowing for the barbarians to cause considerable damage to the northern provinces of Germania Inferior, Belgica Prima, and Belgica Secunda before the empire saw them as a threat. In response to the barbarian invasion of Gaul, the usurper Constantine III halted the masses of Vandals, Alans, and Sueves, confining them to northern Gaul. But in the spring of 409, Gerontius led a revolt in Hispania and set up his own emperor, Maximus. Constantine, who had recently been elevated to the title of Augustus, set off to Hispania to deal with the rebellion. Gerontius responded by stirring up the barbarians in Gaul against Constantine, convincing them to mobilize again, and, in the summer of 409, the Vandals, Alans, and Suevi began pushing south towards Hispania.





