Researchers have tried to look into how true to Viking life were the Icelandic sagas of the Norse people, which are thousand-year-old chronicles of brave deeds and timeless romances.
Writing in Significance, Padraig Mac Carron and Ralph Kenna use a statistical network of associations between characters to find out.
While the stories involve a cast of thousands, recurring characters have emerged as the stories passed into historical legend.
A set of recurring characters living within the same fictional world is not restricted to ancient stories, such as the Norse or Greek myths, but remains a popular device in modern comic and film franchises.
By exploring the number of "too-good-to-be-true" interactions between protagonists, the researchers built a network of recurring characters which in turn could help reveal if the stories are invented or if they are based on a real society.
"We gathered data for 18 narratives, five of which contain over 100 characters each. These are Njals saga, Laxdaela saga, Vatnsdaela saga, Egils saga Skallagrimssonar and Gisla saga Surssonar," Mac Carron said.
"We examined these five individually in order to compare different sagas to each other. We also studied the sagas collectively and from a network of 1549 individual characters we were able to gain insight into the structure of the overall saga society.
"We can conclude that whether the sagas are historically accurate or not, the properties of the social worlds they record are similar to those of real social networks," Kenna said.
