Anglo-Saxon migration debate (5th–6th centuries)
Historians long argued over whether the Anglo-Saxons replaced Britain's Romano-British population or only its elite. Ancient DNA later showed substantial continental ancestry in early medieval England, supporting large-scale migration.
The genetic evidence shifted the debate toward migration models.
It also showed that language and culture spread with people, not only through imitation.
The Gothic case follows the same pattern: genetic data are testing a migration story that historians had treated skeptically.
