OLD Kveldulf knew it was time to get out of Norway. He had pushed his luck by refusing to swear allegiance to Harald Tanglehair - a king not to be trifled with. When the king slew his son Thorolf, Kveldulf went berserk. He and his surviving son Skallagrim ambushed two of the king's emissaries, killing them and 50 companions, and fled to sea. Luckily, safer shores awaited them. This was the 9th century and Norsemen had lately begun to settle Iceland, a thousand kilometres to the west. As they sailed, though, father and son's ships became separated. Exhausted by his...