The Franks

The Franks (Latin: Franci or gens Francorum) are historically first known as a group of Germanic tribes that inhabited the land between the Lower and Middle Rhine in the 3rd century AD, and second as the people of Gaul who merged with the Gallo-Roman populations during succeeding centuries, passing on their name to modern-day France and becoming part of the heritage of the modern French people. Some Franks raided Roman territory, while other Frankish tribes joined the Roman troops of Gaul. In later times, Franks became the military rulers of the northern part of Roman Gaul. With the coronation of their ruler Charlemagne as Imperator Romanorum by Pope Leo III in 800 CE, he and his successors were recognised as legitimate successors to the emperors of the Western Roman Empire.

The Salian Franks lived on Roman-held soil between the Rhine, Scheldt, Meuse, and Somme rivers in what is now Northern France, Belgium and the southern Netherlands. The kingdom was acknowledged by the Romans after 357 CE. Following the collapse of Rome in the West, the Frankish tribes were united under the Merovingians, who succeeded in conquering most of Gaul in the 6th century, which greatly increased their power. The Merovingian dynasty, descendants of the Salians, founded one of the Germanic monarchies that would absorb large parts of the Western Roman Empire. The Frankish state consolidated its hold over the majority of western Europe by the end of the 8th century, developing into the Carolingian Empire. This empire would gradually evolve into the state of France and the Holy Roman Empire.

...
Wikipedia