It appears to be a story from Ancient Greek Myths and Legends - One of the Stories of the Ancient Greeks. To give you a better answer one has to be a historian specializing in Greek Mythology. But I can say few things about your cameo.
It's made of sardonyx, multilayered carnelian-classic material for cameos since 3,000 ago. It's made sometimes in mid 1800s; the cameo is from either Italy or Germany and the frame probably manufactured in England.
This piece appears to be in good condition and is quite valuable. Good luck with it.
Alec Stromberg, 2011 1st place winner Gemmys award of Lapiday magazine Los Angeles, California
