Thanks for the suggestions, Wolfdog2 and Mr. Broken! If you like that trilogy, anderson did some other works either based on saga material (e.g. Hrolf Kraki's saga) or simply set in the saga world, with normal saga-type plots, though the only character/story with much real footprint to study histor...

poul anderson - the last viking trilogy. historical fiction of the life of harald hardraada aka harald III who died at stamford bridge.