Upset, Zeus decreed that Thetis should therefore marry Peleus, King of Phthia. Thetis only agreed to this arangement on the condition that all the gods should be present at the wedding.
The wedding was going smoothly until suddenly an uninvited guest stormed in. She was well miffed. Eris always was of course, being the goddess of discord but this time she had good reason! How dare all the other gods be invited to the wedding but not her!
Her snaky locks, sour looks and violent temper startled everyone. Eris, however merely tossed a beautiful golden apple into the centre of the banquet and vanished.
One by one the women left the competition, as such it had become until it was a straight choice between Hera (Goddess of Motherhood), Athena (Goddess of Wisdom and Warcraft) and Aphrodite (Goddess of Love and Poetry).
Zeus wisely began looking for someone else to be the judge, not wanting to get involved in a dispute between goddesses, knowing what they can be like about this kind of thing. He wished he'd never touched the accursed apple. One by one all the men in the wedding refused to take the place of Zeus. That is until Zeus asked a foolish young Youth named Paris.
Well Paris was the heir to the throne of Troy. And the woman Aphrodite promised him was Helen, queen of Sparta. Paris, aided by Aphrodite, sucessfully seduced her. Unfortunately she was married to Menelaus, King of Sparta. The rest, as they say, is history.
Incidentally, my daughter has the bithday 23rd May (23/05) and is called Claire (the fair one). Explains a lot really!
Followers of Eris are called Discordians.