843 - Vikings attacked Nantes

Viking ships on the Bayeux tapestry
France
A viking fleet of 67 ships sailed up Loire and created a terrible bloodbath in Nantes, where a huge crowd was gathered for St. Johns day.
The Frankish empire was split up in 3 parts and vikings established their first raiding base in France at Noirmoutier.
Hastein was mentioned for the first time, he was a son of Ragnar Lothbrok.
Prudence of Troyes began writing on Annales Bertiniani
Netherlands
Friesland was under control by Danes from 843-885.