Heimskringla is a collection of tales about the Norwegian kings , beginning with the legendary Swedish dynasty of the Ynglingas , followed by accounts of historical Norwegian rulers from Harald Fairhair of the 9th century up to 1177 . Heimskringla is a collection of sagas about the Norwegian kings , beginning with the saga of the legendary Swedish dynasty of the Ynglings , followed by accounts of historical Norwegian rulers from Harald Fairhair of the 9th century up to the death of the pretender Eystein Meyla in 1177 .