Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Gryting was, according to the Heimskringla, a king of Orkdal in the period leading up to Harald Fairhair's unification of Norway. He was the first leader in Trøndelag to make a stand against King Harald's ravaging of the country. At the Battle of Orkdal Gryting's men were defeated and Gryting taken prisoner. After this Gryting swore allegiance to king Harald.