Source : Webster's Revised Unabridged Dictionary (1913)

Saga \Sa"ga\ (s[=a]"g[.a]), n.; pl. {Sagas} (-g[.a]z). [Icel.,
   akin to E. saw a saying. See {Say}, and cf. {Saw}.]
   A Scandinavian legend, or heroic or mythic tradition, among
   the Norsemen and kindred people; a northern European popular
   historical or religious tale of olden time.

         And then the blue-eyed Norseman told A saga of the days
         of old.                                  --Longfellow.