Final answer:
The Franks were not a Germanic tribe that came to Britain in AD 449. They settled in Gaul and formed a kingdom there, whereas the Angles and the Saxons from northern Germany and Denmark became known as Anglo-Saxons after invading Britain.
Step-by-step explanation:
The Germanic tribe that was not one of the tribes to come to Britain in AD 449 is the Franks. Other migratory groups during this period, such as the Franks, settled in Gaul, and their kingdom eventually ruled the region until the ninth century after expelling the Romans. The invasion of Germanic peoples into Britain, including the Angles and the Saxons, led to the occupation of southern Britain in the late fifth century. These groups, coming from modern-day southern Denmark and northern Germany, merged into one known as the Anglo-Saxons. The Germanic tribes referred to here played a significant role in shaping early English history, particularly after the Roman legions left Britain around 400 CE.