801 Charlemagne provoked the Danes

The rune alphabet
Ansgar, the missionary and later saint was born on the 8 September at Amiens.
Emperor Charlemagne formally gave the empty Nordalbian territory (modern-day North  East Germany) to the heathen Slav tribe the Obrotrites. This was a provocation against the Danes.
a strong central authority appeared to have been established in Jutland, and the Danes were ready to leave their own territory for land, trade and plunde
Nordic mythology 9 worlds
Rus was Old Norse for “he who rows” and Rus Viking traders had established trade routes to Bagdad. Archeological discoveries of Sassanid, Arab dirham coins dated no later than 804–805 at Peterhof, near Saint-Petersburg. The Rus would later found the towns of Kiev and Novgorod.
Viking gods