Ermanaric, a notable Greuthungian king, is recognized for his significant rule over a considerable portion of Oium, the region of Scythia inhabited by the Goths during his time. His reign is documented in the writings of the Roman historian Ammianus Marcellinus and later by the sixth-century historian Jordanes in his work, Getica.
Modern historians have debated the extent of Ermanaric's dominion. Herwig Wolfram suggests that at one point, he may have presided over a vast realm stretching from the Baltic Sea to the Black Sea, reaching as far east as the Ural Mountains. However, Peter Heather challenges this assertion, arguing that such an expansive empire would surpass any known Gothic political structure and would have left more substantial evidence in historical records.
Despite the uncertainties surrounding the size of his kingdom, Ermanaric's legacy endures, not only in historical texts but also in later Germanic heroic legends where he appears in a fictionalized manner. His story reflects the complexities of leadership and the tumultuous era preceding the Hunnic invasion.