842 - Vikings gained a stronghold in Dublin

Ireland
The first recorded Irish-Viking alliance according to the Irish chronicles, camps were build at Lough Swilly(Donegal), Rosnaree(Meath) and Cael Uisce(Uncertain).
France
A viking fleet destroyed Quentovic(South of Bourgogne) they killed and captured everybody and left nothing, except for the building the owners bought free.

Russia
Hustyn Chronicle tells that Askold and Dir ruled the Rus, they were Swedish nobles or descendants of Swedes.