theogony

from WordNet (r) 3.0 (2006)

theogony
    n 1: the study of the origins and genealogy of the gods

from The Collaborative International Dictionary of English v.0.48

Theogony \The*og"o*ny\, n. [L. theogonia, Gr. ?; ? a god + the
   root of ? to be born. See {Theism}, and {Genus}.]
   The generation or genealogy of the gods; that branch of
   heathen theology which deals with the origin and descent of
   the deities; also, a poem treating of such genealogies; as,
   the Theogony of Hesiod.
   [1913 Webster]