Don't forget the soap

While the Danes and Norsemen were hitting England and France, the Swedes were terrorizing and settling what is now Russia and the Baltic republics.

So how far did they get? To Contantinople...

History here includes this factoid:

The first record of Vikings in Byzantium is in 839 when a delegation had to return home via Germany. A more forceful encounter occurred in 860 when a large raiding force terrorized Constantinople for ten days. Trading treaties were made in 907 and 911.

An interesting element of these treaties is that they gave the Rus unlimited free baths.