The Suebi (or Suebians, also spelled Suevi, Suavi) were a large group of Germanic peoples originally from the Elbe river region in what is now Germany and the Czech Republic. In the early Roman era they included many peoples with their own names such as the Marcomanni, Quadi, Hermunduri, Semnones, and Lombards. New groupings formed later, such as the Alamanni and Bavarians, and two kingdoms in the Migration Period were simply referred to as Suebian.Although Tacitus specified that the Suebian group was not an old tribal group itself, the Suebian peoples are associated by Pliny the Elder with the Irminones, a grouping of Germanic peoples who claimed ancestral connections. Tacitus mentions Suebian languages, and a geographical "Suevia".

The Suevians were first mentioned by Julius Caesar in connection with the invasion of Gaul by the Germanic king Ariovistus during the Gallic Wars. Unlike Tacitus he described them as a single people, distinct from the Marcomanni, within the larger Germanic category who he saw as a growing threat to Gaul and Italy in the first century BC, as they had been moving southwards aggressively, at the expense of Gallic tribes, and establishing a Germanic presence in the immediate areas north of the Danube. In particular, he saw the Suebians as the most warlike of the Germanic peoples.

During the reign of Augustus the first emperor, Rome made aggressive campaigns into Germania, east of the Rhine and north of the Danube, pushing towards the Elbe. After suffering a major defeat to the Romans in 9 BC, Maroboduus became king of a Suevian kingdom which was established within the protective mountains and forests of Bohemia. The Suevians did not join the alliance led by Arminius.Under the reign of Marcus Aurelius in the 2nd century AD, the Marcomanni, perhaps under pressure from East Germanic tribes to their north, invaded Italy.By the Crisis of the Third Century, new Suebian groups had emerged, and Italy was invaded again by the Juthungi, while the Alamanni ravaged Gaul and settled the Agri Decumates. The Alamanni continued exerting pressure on Gaul, while the Alamannic chieftain Chrocus played an important role in elevating Constantine the Great to Roman emperor.

By the late 4th century AD, the Middle Danubian frontier inhabited by the Quadi and Marcomanni received large numbers of Gothic and other eastern peoples escaping disturbances associated with the Huns. In 406 AD, Suebian tribes led by Hermeric, together with other Danubian groups including Alans and Vandals, crossed the Rhine and overran Gaul and Hispania. They eventually established the Kingdom of the Suebi in Galicia. With the breaking up of Hunnic power after the Battle of Nedao there was also a short-lived Kingdom of the Suebi on the Danube, under Hunimund. They were defeated by the Ostrogoths, one of the peoples of eastern origin who had been allies of the Huns. In the sixth century the Suevic Longobards moved from the Elbe to become one of the major powers of the Middle Danube, in competition with the dynasties from the east such as the Herules, Gepids and Ostrogoths.

During the last years of the decline of the Western Roman Empire, the Suebian general Ricimer was its de facto ruler. The Lombards, with many Danubian peoples both Suebian and eastern, later settled Italy and established the Kingdom of the Lombards.

The Alamanni, Bavarii and Thuringii who remained in Germania gave their names to the still-existing German regions of Swabia, Bavaria and Thuringia respectively. Suebian languages are thought to be a main source of the later High German languages, especially the Upper-German dialects predominant in Southern Germany, Switzerland and Austria, which experienced the Second consonant shift some time after about 600 AD.

The Visigoths (; Latin: Visigothi, Wisigothi, Vesi, Visi, Wesi, Wisi) were an early Germanic people who, along with the Ostrogoths, constituted the two major political entities of the Goths within the Roman Empire in late antiquity, or what is known as the Migration Period. The Visigoths emerged from earlier Gothic groups, including a large group of Thervingi, who had moved into the Roman Empire beginning in 376 and had played a major role in defeating the Romans at the Battle of Adrianople in 378. Relations between the Romans and the Visigoths were variable, alternately warring with one another and making treaties when convenient. Under their first leader, Alaric I, the Visigoths invaded Italy and sacked Rome in August 410. Afterwards, they began settling down, first in southern Gaul and eventually in Hispania, where they founded the Visigothic Kingdom and maintained a presence from the fifth to the 8th centuries AD.The Visigoths first settled in southern Gaul as foederati to the Romans, a relationship that was established in 418. However, they soon fell out with their Roman hosts (for reasons that are now obscure) and established their own kingdom with its capital at Toulouse. They next extended their authority into Hispania at the expense of the Suebi and Vandals. In 507, however, their rule in Gaul was ended by the Franks under Clovis I, who defeated them in the Battle of Vouillé. After that, the Visigoth kingdom was limited to Hispania, and they never again held territory north of the Pyrenees other than Septimania. An elite group of Visigoths came to dominate the governance of that region at the expense of those who had previously ruled there, particularly in the Byzantine province of Spania and the Kingdom of the Suebi.

In or around 589, the Visigoths under Reccared I converted from Arianism to Nicene Christianity, gradually adopting the culture of their Hispano-Roman subjects. Their legal code, the Visigothic Code (completed in 654), abolished the longstanding practice of applying different laws for Romans and Visigoths. Once legal distinctions were no longer being made between Romani and Gothi, they became known collectively as Hispani. In the century that followed, the region was dominated by the Councils of Toledo and the episcopacy. Little else is known about the Visigoths' history during the 7th century, since records are relatively sparse. In 711, an invading force of Arabs and Berbers defeated the Visigoths in the Battle of Guadalete. The Visigoth king, Roderic, and many members of their governing elite were killed, and their kingdom rapidly collapsed. This was followed by the subsequent formation of the Kingdom of Asturias in northern Spain and the beginning of the Reconquista by Christian troops under Pelagius.During their governance of Hispania, the Visigoths built several churches that survived. They also left many artifacts which have been discovered in increasing numbers by archaeologists in recent years. The Treasure of Guarrazar of votive crowns and crosses are the most spectacular. They founded the only new cities in western Europe from the fall of the Western half of the Roman Empire until the rise of the Carolingian dynasty. Many Visigothic names are still in use in modern Spanish and Portuguese languages. Their most notable legacy, however, was the Visigothic Code, which served, among other things, as the basis for court procedure in most of Christian Iberia until the Late Middle Ages, centuries after the demise of the kingdom.