[henrikschroder]

> I think the Scandinavians have a slightly clearer picture of their descent due to the later expansion of the new religion into their territories.

Not really, the oldest Scandinavian kings that historians are pretty certain were real people were Harald Fairhair who was king of Norway around 900CE, Gorm the Old who was king of Denmark around 930CE, and Eric the Victorious who was king of Sweden around 970CE.

And the sources we have for the ancient kings were usually continental scholars, monks, bishops, or missionaries, who most probably had an agenda, and an antagonistic view of the pagans up north. And likewise, when the Scandinavians told their history to the weird people from the south, they probably embellished their stories.

...unlike for example Charles Martel and early French dynasties, who were 200 years earlier than the known Scandianavians.

Sorry to burst your bubble, but Scandinavia was a completely uncivilized backwater. :-)