Its subject is King Sverre Sigurdsson of Norway (r. 1177–1202) and it is the main source for this period of Norwegian history.
The saga is obviously written by someone sympathetic to Sverre’s cause, but the strict demands of the genre ensure some degree of impartiality.
Central to this part is Sverre Sigurdsson's claim to be the son of King Sigurd Munn and his struggle against his rival claimant Magnus Erlingsson.
[5][6] Grýla is written in a unique style that to some degree seems to be inspired by the long medieval tradition of hagiography.
Instead of narrowly focusing on the king and major events of state, Sverris saga is a detailed and rich biography with a large cast of characters, elaborate scenes and dialogue.