Germania, Germani, Germanica have all been used to refer to the group of peoples comprising of the German Tribes in the first centuries CE (AD), We have good and reliable written information from the Roman author Tacitus' Germania and Agricola, as well as other sources.

The Migration Period, also called Barbarian Invasions or Völkerwanderung, is a name given by historians to a human migration which occurred within the period of roughly AD 300–700 in Europe, marking the transition from Late Antiquity to the Early Middle Ages.

The migration included the Goths, Vandals, and Franks, among other Germanic, Bulgar and Slavic tribes. The migration may have been triggered by the incursions of the Huns (not a Germanic tribe), in turn connected to the Turkic migration in Central Asia, population pressures, or climate changes.

The migration movement may be divided into two phases; the first phase, between AD 300 and 500, largely seen from the Mediterranean perspective, put Germanic peoples in control of most areas of the former Western Roman Empire. (See also: Ostrogoths, Visigoths, Burgundians, Alans, Langobards, Angles, Saxons, Jutes, Suebi, Alamanni). The first to formally enter Roman territory — as refugees from the Huns — were the Visigoths in 376. Tolerated by the Romans on condition that they defend the Danube frontier, they rebelled, eventually invading Italy and sacking Rome itself (410) before settling in Iberia and founding a 200-year-long kingdom there. They were followed into Roman territory by the Ostrogoths led by Theodoric the Great, settling in Italy itself.

In Gaul, the Franks, a fusion of western Germanic tribes whose leaders had been strongly aligned with Rome, entered Roman lands more gradually and peacefully during the 5th century, and were generally accepted as rulers by the Roman-Gaulish population. Fending off challenges from the Allemanni, Burgundians and Visigoths, the Frankish kingdom became the nucleus of the future states of France and Germany. Meanwhile Roman Britain was more slowly conquered by Angles and Saxons.

The second phase, between AD 500 and 700, saw Slavic tribes settling in Eastern Europe, particularly in eastern Magna Germania, and gradually making it predominantly Slavic. The Bulgars, who were present in far eastern Europe since the second century, in the seventh century expanded their kingdom to eastern Balkan territory of the Byzantine Empire.

The Arabs tried to invade Europe via Asia Minor in the second half of the seventh century and the early eighth century, but were eventually defeated at the siege of Constantinople by the joint forces of Byzantium and Bulgaria in 717-18. At the same time, they invaded Europe via Gibraltar, conquering Hispania (the Iberian Peninsula) from the Visigoths in 711 before finally being halted by the Franks at the Battle of Tours in 732. These battles largely fixed the frontier between Christendom and Islam for the next three centuries.

During the eighth to tenth centuries, not usually counted as part of the Migrations Period but still within the Early Middle Ages, new waves of migration, first of the Magyars and later of the Turkic peoples, as well as Viking expansion from Scandinavia, threatened the newly established order of the Frankish Empire in Central Europe.

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