Rhea was an human female thrall living during the Age of Fire. She was given to the Copper as a gift from Rethoanna after she cleaned the Copper's scales for the first time. Rhea remained with the Copper throughout most of her early life and eventually met and married Rayg , bearing him several children. Rhea was probably mute, or at least never spoke to dragons.
It has been hinted that the experience of being seized and brought by SiDrakkon into his harem of humans, deeply shocked the young girl because for much time the Copper kept listening her crying at night, despite the Copper's attempts to treat her well and keep her mind away from the bad experience.