According to the Icelandic sagas early Viking Age chieftains enjoyed hunting and entertaining their entourages in the forests and on the lakes in this area. King Halfdan the Black, father of king Harald Fairhair who united Norway, often visited Hadeland. According to historical sources he and his men attended a banquet here in the winter of 860. As they were crossing the ice on Randsfjord on their way home to Ringerike, the ice gave way and horses, men, and the 40-year-old king himself drowned. The Hadeland Folkemuseum is built around a Viking burial mound at Granavollen which according to folklore contains the torso of King Halvdan.