Iris

Iris is the daughter of Thaumus and Electra.  The goddess of the rainbow, she is the primary messenger of the gods in the Illiad.  In the Aeneid, Iris actually travels down to earth on a rainbow to deliver her messages to the mortals.

Source(s):

  1. HesiodTheogeny.

  2. VirgilAeneid.

  3. HomerIlliad.