[1] : The Collaborative International Dictionary of English v.0.48

saga \sa"ga\ s=a"g.a, n.; pl. sagas -g.az. 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.
   1913 webster

         and then the blue-eyed norseman told
         a saga of the days of old.               --longfellow.
   1913 webster
see also:
sagas say saw 

Sagas >> S Words
Sagas, definition of term: Sagas
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