Heimskringla
Heimskringla is the best known of the Old Norse kings' sagas. It was written in Old Norse in Iceland. While authorship of Heimskringla is nowhere attributed, some scholars assume it is written by the Icelandic poet and historian Snorri Sturluson (1178/79–1241) c. 1230. The title Heimskringla was first used in the 17th century, derived from the first two words of one of the manuscripts. 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. Some of the exact sources of Heimskringla are disputed, but they include earlier kings' sagas, such as Morkinskinna, Fagrskinna and the 12th-century Norwegian synoptic histories and oral traditions, notably many skaldic poems. The author or authors explicitly name the now lost work Hryggjarstykki as their source for the events of the mid-12th century. 
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