Paul, -Nothing in this discussion is in Swedish and I am sure that there are several words here which have a totally different meaning in other languages. Who cares?
http://en.wikipedia.org/wiki/Saga
Back to King Aun "The Aged" Jörundsson of Uppsala, - some of the sagas tells that he was over 200 years when he died (explaining the name "den gamle" - "the old") by getting an extended lifetime by the sacrifice of a son to Odin. He was finally stopped from killing his last son Egil and dies.
I don't think you will find professional historians who will dare to estimate any dates based on that history ;-)
I'm not sure fairytale is a good translation for saga. Sagas are a particular kind of literature. The word saga is related to the English verb "to say". Sagas are stories, true or false. Some people like to guess dates when there is no evidence. A historian will ignore them. If people have different guesses, how do you decide which one is right?
Reed about Aun (the old) http://en.wikipedia.org/wiki/Aun . In this stub of a story it is refered to legends/myths (also called saga).
The mounds in Gamla Uppsala where possibel Aun is buried are from 5th century AD. Therefore I think Aun is born about the year of 500 AD. http://en.wikipedia.org/wiki/Gamla_Uppsala . Let us write birthyear for Aun ca 500 and his daughter is born ca 550 in the "ancestrytree" for these people. I do not think we comes closer in this case ever, either we argue a whole year or not.
Arnfred Nilsen