Originally Posted by
Aeratus
Take, for example, the Franks. As shown in Attila TW, the Franks during this time occupied only a small region. Given that the population density of barbarian settlements was even lower than that of Romanized Gaul while also being significantly smaller in geographical area than Romanized, it is impossible that the Franks were populous enough to change the genetic makeup of Gaul. The Franks, of course, did change the cultural identity of Gaul, but cultural identity is not the same as genetics.
Also, a lot of older studies are misleading, because they don't focus on modern genetics, but more on the concept of "identity" and culture. Again, cultural identity and genetic identity have been mixed, because genetics are not easily discernible prior to modern testing. People take on the cultural identity of their conquerors all the time. This was the reason why the English was originally (and incorrectly) thought to have been mostly Germanic until modern genetics studies were conducted.