The correct answer is:
The Franks
Explanation:
The Franks, who lived among the North Sea and the upper Rhine, were the most important Germanic tribe. The Franks worked with Rome before the fall of the Roman Empire, but when Rome was collapsing they invaded Gaul and established their own kingdoms.
The Franks fought against other Germanic tribes under the rule of King Clovis (481-511) and conquered the territory of France (which is named after them). Franks were converted to Catholicism and won the support from the Pope, the Franks adopted Roman and Germanic culture and conquered many Barbarian tribes, which made their kingdom stronger.
