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If you know you have a less than 10 genetic distance to the DNA sample known as Late Medieval Icelandic Murderer KOV-A2 (mytrueancestry.com), I have been able to create a tree from this sample/person; and a branch leading to his 19th great grandfather, King Harald Finehair Sigurdson, King of Norway, Viking Era.
(The above referenced branch was proven to be incorrect and the tree branch has since been reset pending further reteach.)
(Anyone with access can provide some good research here: https://www.familysearch.org/library/books/viewer/106072/?offset=0#...)