Hallvard Graatop was a Norwegian rebel leader who fought against Erik of Pomerania. The name "Graatop", meaning "Gray-top" is probably a nom de guerre, possibly referring to gray hair or a gray hood (as a wanted outlaw, he may have concealed his face). Graatop's true identity is unknown. Popular stories in the Telemark area claim him to be "Lord" Hallvard Torbjørnsen of Roaldstad (later known as Vrålstad) farm, grandfather of Aslaug Torbjørnsdatter Vrålstad (herself an ancestor of Queen Sonja of Norway and Andrew Volstead), but this is disputed (see "Controversy", below).
Read more about Hallvard Graatop: Causes of The Conflict, Controversy