Primary Sources
The main sources for Sigurd and his era are the kings' sagas Heimskringla, Fagrskinna, and Morkinskinna. They in turn base their accounts on the now lost Hryggjarstykki, whose author, Eiríkr Oddsson, either witnessed the events himself, or spoke to people who had.
Read more about this topic: Sigurd Slembe
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“A fact is a proposition of which the verification by an appeal to the primary sources of our knowledge or to experience is direct and simple. A theory, on the other hand, if true, has all the characteristics of a fact except that its verification is possible only by indirect, remote, and difficult means.”
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