From Norwegian American
https://www.norwegianamerican.com/oskoreia/
Oskoreia is the Norwegian version of The Wild Hunt, an ancient European folk myth found in many societies across the Continent. Its genealogy is unclear. But the repercussions of an event described in an entry in the Anglo-Saxon Chronicle for 793 suggests a Viking origin:

“In this year dire portents appeared over Northumbria and sorely frightened the people. They consisted of immense whirlwinds and flashes of lightning, and fiery dragons were seen flying in the air. A great famine immediately followed those signs, and a little after that in the same year, on 8 June, the ravages of heathen men miserably destroyed God’s church on Lindisfarne, with plunder and slaughter.