[1] It is now in the Wallace Collection in London, which also houses Titian's version of the same subject, whose composition Lemoyne borrowed and reversed for his work.
[4] The painting presents the mythological theme of Perseus and Andromeda, inspired by Ovid's Metamorphoses (Book IV).
After consulting the oracle of Ammon, the king, Cepheus, decides to offer his daughter to the monster in order to stop the disaster.
Perseus, returning from his victory over the gorgon Medusa, sees Andromeda, chained naked to a rock on the edge of the shore.
Falling instantly in love with the princess, he promises Cepheus to kill the sea monster on the condition that he marry Andromeda.