I'd been hoping, based on the title, that scholars knew the facts of Harald Fairhair's life, so that the datable legends about the first true Norwegian king would provide a case study in how mythmaking works: in effect, following along as generations of storytellers start with the facts, discard some, exaggerate others and conjure large parts of their narrative from thin air (or from an ancestral stock of folktales).
We can't do that kind of precision stratigraphic analysis for, say, King David, who might be considered a sort of Judean Fairhair -- we know nothing, or almost nothing, of the historical David, though plenty of experts have tried to tease out which parts of Samuel and Kings were written when, and for what purpose.
It turns out we don't have the facts about Harald, either. It's disappointing but doesn't detract from the job Lincoln has done explaining the differences between the various accounts of Harald's life -- who wrote them, what audiences were intended (later Norwegian kings? anti-monarchical Icelanders? both?) and how that affected the way the story was told. Interesting stuff, explained clearly enough for an outsider to the field, and it reminded me strangely of John Van Seters' work on pro- and anti-David propaganda in his books "In Search of History" and "The Biblical Saga of King David. " ("Saga," by the way, was not a term Van Seters, who was familiar with scholarship on Norse legends, chose randomly.)
Postmodernists will be annoyed to learn that Lincoln regrets having written his most famous line, in "Theorizing Myth": "If myth is ideology in narrative form, then scholarship is myth with footnotes." Too glib, he says here, and "Between History and Myth" is partly an attempt to "do better." Even French public intellectuals, however, should enjoy the brief digression on the trope of the long-haired and/or long-bearded hero, illustrated by four pages of portraits of (among others) Harald himself, St. John the Baptist, King Mswati III of Swaziland, John Brown, Che Guevara, Blackbeard the pirate, Rasputin and Rabbi Menachem Schneerson. Nothing like a company Shutterstock account to make an editor's job more fun.