The most famous tale of Eris recounts her initiating the Trojan War by causing the Judgement of Paris. The goddesses Hera, Athena and Aphrodite had been invited along with the rest of Olympus to the forced wedding of Peleus and Thetis, who would become the parents of Achilles, but Eris had been snubbed because of her troublemaking inclinations.
She therefore (as mentioned at the Kypria according to Proclus as part of a plan hatched by Zeus and Themis) tossed into the party the Apple of Discord, a golden apple inscribed τῇ καλλίστῃ (Ancient Greek: tē(i) kallistē(i)) "For the most beautiful one", or "To the Fairest One" provoking the goddesses to begin quarreling about the appropriate recipient. The hapless Paris, Prince of Troy, was appointed to select the fairest by Zeus. The goddesses stripped naked to try to win Paris' decision, and also attempted to bribe him. Hera offered political power; Athena promised infinite wisdom; and Aphrodite tempted him with the most beautiful woman in the world: Helen, wife of Menelaus of Sparta. While Greek culture placed a greater emphasis on prowess and power, Paris chose to award the apple to Aphrodite, thereby dooming his city, which was destroyed in the war that ensued.
https://en.wikipedia.org/wiki/Eris_(mythology)
Eris (/ˈɪərɪs, ˈɛrɪs/; Greek: Ἔρις, "Strife")[1] is the Greek goddess of strife and discord. Her name is the equivalent of Latin Discordia, which means "discord". Eris' Greek opposite is Harmonia, whose Latin counterpart is Concordia. Homer equated her with the war-goddess Enyo, whose Roman counterpart is Bellona. The dwarf planet Eris is named after the goddess, as is the religion Discordianism.
"The Golden Apple of Discord", labelled Kallisti ("For the Most Beautiful One")
Into the hand of Chaos and Discord goes the victim!
Strife whose wrath is relentless, she is the sister and companion of murderous Ares, she who is only a little thing at the first, but thereafter grows until she strides on the earth with her head striking heaven. She then hurled down bitterness equally between both sides as she walked through the onslaught making men's pain heavier. She also has a son whom she named Strife.
A quick study and warning. The Cosmic divine! Ohhhh how I love Mythology! 
