The document provides background information on the Vikings from 790AD to 1066AD. It discusses the geographical features of Scandinavia that the Vikings inhabited, including the rocky terrain, coastal settlements, forests, lakes and fjords. It also summarizes Viking social structure, featuring earls/jarls as the aristocracy, karls as the majority free people, and thralls as slaves. Additionally, it outlines key figures like King Harald Bluetooth who helped unite Denmark. Burial sites have provided archaeological evidence of how Vikings lived and the weapons they used. The Vikings established many settlements throughout Europe and beyond.