From the Guardian:
Peter Sawyer, who has died aged 90, was perhaps the most influential scholar of the Vikings and their activities in the last 70 years. His book The Age of the Vikings (1962) radically challenged the current orthodoxy, presenting the Vikings as “traders not raiders”. Peter did not deny their destructiveness, but he challenged its scale by looking hard at the question of Viking numbers, and at their ships, and by pointing to the destruction carried out by their contemporaries.
The debates opened up by the book have lasted through to the present, and while the position set out by Peter in 1962 has been modified, there has been no going back to the earlier image of destruction. As the runologist Ray Pagenoted in his review: “The Vikings will never be the same again.” Peter himself made further major interventions in his Kings and Vikings (1982), which looked more closely at the political structures of the Viking age, and in work published jointly with his second wife, Birgit (Bibi), notably Die Welt der Wikinger (The World of the Vikings, 2002).
More at the link.