In Greek mythology, Glauce refers to two different people: Greek mythology comprises the collected narratives of Greek gods, goddesses, heroes, and heroines, originally created and spread within an oral-poetic tradition. ...
Daughter of Creon, Glauce married Jason. She was killed, along with Jason's children, by his wife, Medea. Also known by the name Creusa, predominantly in Latin authors, e.g. Seneca (Medea) and Propertius (2.16.30).
Glauce encourages Jason to send Medea (Kirsten Olesen) and her children into exile, and King Creon, with no resistance from Jason, seeks to enforce the decree.
When Jason and Glauce perform their nuptial rites (a scene using shadow play and silhouette to awesome effect), adjacent shots of Medea in her hovel, growing increasingly mad, suggest that she is magically aware of the betrayal as it happens.
For example, we do not see Glauce in her death throes; instead, in one of the movies many standout tableaux, a horse who has been pricked by the crown storms out of the stables and runs full tilt on the beach in a panic.