'destroyer') is the brother of Aeëtes, Aloeus, Circe and Pasiphaë, which makes him a son of Helios, the god of the sun, by Perse, an Oceanid nymph.
Perses' brother Aeëtes had been warned by an oracle that great peril would come to him if the golden fleece was ever removed from Colchis.
[4] One tale goes that after Perses seized power, Medea's son by either Aegeus or Jason,[5] Medus, arrived in Colchis and was imprisoned immediately, though under a false identity.
Medea arrived in Colchis too, claiming to be a priestess of Artemis, and unknowingly, betrayed her son's true identity to Perses.
Medea, under the pretext of simply wanting to talk to him, secretly gave Medus a sword, and explained what had happened to his grandfather Aeëtes.