Discordia.

It is recounted that Zeus held a banquet in celebration of the marriage of Peleus. However, Eris, goddess of discord was not invited, for she would have made the party unpleasant for everyone. Angered by this snub, Eris arrived at the celebration with a golden apple from the Garden of the Hesperides, which she threw into the proceedings, upon which was the inscription καλλίστῃ (kallistēi, "for the fairest one").