Necklace of Harmonia in the context of Oenochoe

In Greek mythology, Harmonia (/hɑːrˈmoʊniə/; Ancient Greek: Ἁρμονία /harmoˈnia/, "harmony", "agreement") is the goddess of harmony and concord. Her Greek opposite is Eris and her Roman counterpart is Concordia. Harmonia is most well-known for her marriage to Cadmus and the many misfortunes that haunted her descendants, particularly those related to the fabled Necklace of Harmonia.

Eriphyle (/ɛrɪˈfaɪliː/; Ancient Greek: Ἐριφύλη, romanized: Eriphúlē) was a figure in Greek mythology who, in exchange for the Necklace of Harmonia (also called the Necklace of Eriphyle) given to her by Polynices, persuaded her husband Amphiaraus to join the doomed expedition of the Seven against Thebes. She was then slain by her son Alcmaeon.

In Greek mythology, Alphesiboea (Ancient Greek: Ἀλφεσίβοια, romanized: Alphesíboia, pronounced [alpʰesíboi̯a]), in some versions also called Arsinoë (Ancient Greek: Ἀρσινόη, romanized: Arsinóē, pronounced [arsinóɛː]), is an Arcadian princess from the ancient Greek kingdom of Psophis, daughter of King Phegeus. Alphesiboea marries Alcmaeon after the murder of his mother, but he ends up deserting her for the love of another woman. Alcmaeon is then murdered by Alphesiboea's male relatives. Alphesiboea was one of the several owners of the necklace of Harmonia, a cursed artefact that brought ill fortune to its possessors.

Due to the great popularity of Alcmaeon's myth in antiquity, Alphesiboea is known to have appeared in many ancient dramatizations of the story, none of which are preserved today. At least three tragedies titled Alphesiboea are known to have been produced, alongside several Alcmaeons.