Painting on the tondo of a cup, dating to about 480 B.C., now in the Delphi Archaeological Museum, representing the god Apollo, playing his lyre, accompanied by a raven, bird sacred to the god. The raven appears also in the mythological tale of the unhappy love story between Apollo and the young girl Coronis, daughter of Phlegyas, king of Orchomenus in Boeotia. Coronis (whose name signifies “Crow”) fell in love with a mortal young man while bearing a child from Apollo. The news came to the god through a raven, which at those times had white feathers; Apollo, disappointed at the dismal notice, transformed the bird’s colour which became black. The insult enraged the god, who let his sister, Artemis, shoot his arrows against Coronis, but saved the child, who became Asclepius, the healer-god brought up and taught by the Centaur Chiron.

[Source: http://commons.wikimedia.org/wiki/File:Apollo_black_bird_AM_Delphi_8140.jpg]