The forgotten history and the forgotten chronicle

I have taken up the old chronicles and the history of Sweden's oldest family, how members of this family were involved in shaping Sweden's history, one of the most famous Fale helped Erik Knutsson to the king's throne and is probably the same person as the fictional Arn, This Fale had decisive role together with Sune Folkesson in the battle of Gestilren and Lena.