The civil war era in Norway began in 1130 and ended in 1240. During this time in Norwegian history, some two dozen rival kings and pretenders waged wars to claim the throne.

The history of Norway has been influenced to an extraordinary degree by the terrain and the climate of the region. About 10,000 BC, following the retreat inland of the great ice sheets, the earliest inhabitants migrated north into the territory which is now Norway. They traveled steadily northwards along the coastal areas, warmed by the Gulf Stream. They were hunter-gatherers whose diet included seafood and game, particularly reindeer as staple foods. Between 5,000 BC and 4,000 BC the earliest agricultural settlements appeared around the Oslofjord. Gradually, between 1,500 BC and 500 BC, agricultural settlements spread to the entire south Norway, while the inhabitants of the regions north of Trøndelag continued to hunt and fish.