The Heimskringla: A History of the Norse Kings by Snorre Sturlason. Done into English out of the Icelandic by Samuel Laing, revised with notes by Hon. Rasmus B. Anderson (London: Norroena Society, 1907). 3 vols. http://oll.libertyfund.org/titles/1865,
The Heimskringla presents the German mythical god, Odin, as an actual historical figure and the first Norse king. Sturluson traced the history of sixteen famous Nordic kings from this ancient figure through Halvdan the Black (ca. 839-ca. 860) and Magnus V Erlingsson (r. 1162-1184).
The text is in the public domain.