The Franks (Latin: Franci or gens Francorum) were a confederation of Germanic tribes first attested in the third century AD as occupying land on the Lower and Middle Rhine. In the 3rd century some Franks raided Roman territory, while others joined the Roman troops in Gaul. The Salian Franks formed a kingdom on Roman-held soil that was acknowledged by the Romans after 357. After the collapse of imperial authority in the West, the Frankish tribes were united under the Merovingians. During the 6th century they succeeded in conquering most of Gaul. They were active in spreading Christianity over western Europe and had created one of the strongest and most stable post-roman kingdoms.
The Merovingian dynasty, descended from the Salians, founded one of the Germanic monarchies which replaced the Western Roman Empire. The Frankish state consolidated its hold over large parts of western Europe by the end of the eighth century, developing into the Carolingian Empire. This empire would gradually evolve into the state of France and the Holy Roman Empire.
The term Frank was used as a synonym for 'Roman Catholic' in the Middle Ages, as the Franks were rulers most of western Europe and were closely affiliated with the Church in Rome.
Read more about Franks: Etymology, Mythological Origins, Religion, Laws, Legacy