In Greek mythology, Chalciope (Ancient Greek: Χαλκιόπη, "bronze-face" or "with the brass voice") was a Colchian princess, daughter of King Aeëtes and the Oceanid Idyia, sister of Medea and Absyrtus. Aeëtes gave her in marriage without bride-gifts to Phrixus when he arrived on the golden ram; by him she bore Argus, Melas, Phrontis, and Cytisorus. In Apollonius she persuades Medea to aid Jason so that her sons — wrecked and rescued by the Argonauts — may survive. This atlas entry is the Colchian princess — not Aegeus's Athenian wife or other homonyms.
Adapted from Wikipedia, "Chalciope (daughter of Aeetes)" · CC BY-SA 4.0
I.Family
Chalciope's mother was the Oceanid Idyia; her siblings were Medea and Absyrtus. She married Phrixus and bore sons variously listed as Argus, Phrontis, Melas, and Cytisorus (with alternate name-lists in Hyginus and others; some add Presbon).
In Apollonius's Argonautica her son Argus tells Jason that Aeëtes received Phrixus gladly and gave him Chalciope without gifts of wooing; Phrixus died an aged man in Aeëtes's house, and the sons set out for Orchomenus to claim Athamas's possessions.
II.Medea and the Argonauts
When her sons were shipwrecked and rescued by the Argonauts, Chalciope rejoiced to find them among Jason's company and pleaded with Medea to help Jason — fearing Aeëtes's wrath against the boys if the quest failed. Their reunion and her tears are a turning point in Apollonius Book 3.
A later tradition (Hyginus) has her stay loyally with Aeëtes after Perses dethroned him, even though the king had killed Phrixus out of fear of an Aeolid oracle — a version at odds with Apollonius's peaceful old age for Phrixus.
III.Homonyms
Other women named Chalciope include the daughter of Rhexenor (or of Chalcodon), second wife of Aegeus of Athens who bore him no heirs; a Coan mother of Thessalus by Heracles; and the mother of Linus by Apollo. This notice concerns only Aeëtes's Colchian daughter.