Greek mythology has numerous characters besides the seer Calchas, who caused Agamemnon to sacrifice his daughter Iphigeneia to satisfy a requirement of Artemis. Greek mythology is populated with gods and goddesses, humans, creatures, hybrids, mystical forces and such. These stories have been a vital part of Western civilization and have been source material for Renaissancepainters such as Correggio. Pictured: Leda and the Swan.Painting circa 1532.