Roman references to this area as Hadeland may be found in documents dating from AD200-400. The name refers to the "haðar" people. It is thought that "haðar" may relate to one of the many tribes or clans in the area, thus Hadeland would mean "land of the haðar". Archaeologists have found a wide variety of weapons in Iron Age burial sites throughout Hadeland. In the late Iron Age, Hadeland was a petty kingdom. One of the more prominent kings of Hadeland was Halfdan Hvitbeinn who lived in the 8th century.