Obotrites led by Thrasco (or Drożko) and…
798 CE
Obotrites led by Thrasco (or Drożko) and Franks led by legatus Eburisus defeat the Nordalbingian Saxons in the Battle of Bornhöved (or "battle on the Swentana river"), part of the effort by the Frankish emperor, Charles, to conquer and convert Old Saxony.
Danes had settled the northern part of Holstein, Slavic Obotrites the eastern part (Wagria), and Saxons from the south had migrated into western Holstein in the process of the migrations that occurred during sixth and seventh centuries onto the territory.
According to the chronicle, the Saxons lost four thousand warriors and were forced to flee the battlefield.
The victory of Charles in the battle finally breaks the resistance of the Nordalbingian Saxons to Christianization.
Charlemagne decides to massacre the Nordalbingian Saxons or deport them: their areas in Holstein become sparsely populated and are handed over to the Obotrites.