Even where the legendary does not immediately betray itself by elements of the miraculous, by the repetition of well-known standard motives, typical patterns and themes… it is generally quickly recognizable by its composition. It runs far too smoothly.
Auerbach offers the canonical structural distinction between legend and history: legend’s formal smoothness—its suppression of friction, contingency, and realistic detail—marks it as the product of archetypal pattern rather than historical testimony.
, Mimesis: The Representation of Reality in Western Literature, 1953thesis