Source : Webster's Revised Unabridged Dictionary (1913)

Hagiology \Ha`gi*ol"o*gy\, n. [Gr. ? sacred + -logy.]
   The history or description of the sacred writings or of
   sacred persons; a narrative of the lives of the saints; a
   catalogue of saints. --J. H. Newman.

Source : WordNet®

hagiology
     n : literature narrating the lives (and legends) of the saints