"Heimskringla" is a collection of sagas about Swedish and 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.The exact sources of his work are disputed, but included earlier kings' sagas, such as Morkinskinna, Fagrskinna and the twelfth century Norwegian synoptic histories and oral traditions, notably many skaldic poems.