The Viking Age was a time of extensive exploration, trade, and raiding by the Norse people. The Norse people travelled through an impressive amount of Europe and even into the Middle East during this time. At about 1000 C.E., Leif Erikson visits America. Christian monasteries were often targets for Viking raids due to their abundance of resources and little defenses, which created the stereotype that the Norse were bloodthirsty brutes, thanks to records found in Christian manuscripts.
The Viking Age—and subsequently the Old Norse civilization—ended with the Battle of Stamford Bridge.
Most of what we know about historical Norse Heathenry comes from this time.