Hägar the Horrible & his Trelleborg

Hägar the Horrible, an American comic strip created by cartoonist Dik Browne, is distributed to more than 1900 newspapers in 58 countries

and translated into 13 languages.

The strip is a caricature and loose interpretation of Viking lifestyle.
Viking is used to identify all the people who lived in medieval Scandinavia (Denmark, Norway and Sweden).

Hagar's wife, Helga: (Sigh) Being the wife of a traveling man is a trade-off…

He gets to visit the great cities of Europe for three weeks…

and I get a clean house for three weeks!

The Slavs and the Byzantines knew them as the Rus' or Rhōs (the rowing people) or Varangians (faithful men). 

The Vikings were seafaring north Germanic people who raided, traded, explored, and settled in wide areas of Europe, Asia, and the North Atlantic islands from the late 8th to the mid-11th centuries. Their lightweight longships took them as far east as Constantinople and the Volga River in Russia, as far west as Iceland and Greenland and as far south as the Kingdom of Nekor, part of modern-day Morocco.

Trelleborg is the word for a Viking Ring Fortress or a Viking Castle. 10th century Danish ring castles are one of the clearest evidence of a centralized power structure in Denmark’s late Viking Age.

There are seven Viking fortresses known, however there are most certainly more to be found. 

A reconstructed quarter of an old Trelleborg,
with palisades, gate, and a medieval house inside the courtyard.