Because of Eris' disagreeable nature she was the only goddess not to be invited to the wedding of Peleus and Thetis. When she turned up anyway, she was refused admittance and, in a rage, threw a golden apple amongst the goddesses inscribed "To the fairest." Three goddesses laid claim it, and in their rivalry brought about the events which led to the Trojan War.
ERIS (Eris), the goddess who calls forth war and discord. According to the Iliad, she wanders about, at first small and insignificant, but she soon raises her head up to heaven
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"And Nyx (Night) bare hateful Moros (Doom) and black Ker (Violent Death) and Thanatos (Death), and she bare Hypnos (Sleep) and the tribe of Oneiroi (Dreams). And again the goddess murky Nyx, though she lay with none, bare Momos (Blame) and painful Oizys (Misery), and the Hesperides . . . Also she bare the Moirai (Fates) and the ruthless avenging Keres (Death-Fates) . . . Also deadly Nyx bare Nemesis (Envy) to afflict mortal men, and after her, Apate (Deceit) and Philotes (Friendship) and hateful Geras (Old Age) and hard-hearted Eris (Strife)."
"But abhorred Eris (Strife) bare painful Ponos (Toil), and Lethe (Forgetfulness), and Limos (Starvation), and the Algea (Pains), full of weeping, the Hysminai (Fightings) and the Makhai (Battles), the Phonoi (Murders) and the Androktasiai (Man-slaughters), the Neikea (Quarrels), the Pseudo-Logoi (Lies), the Amphilogiai (Disputes), and Dysnomia (Lawlessness) and Ate (Ruin), who share one another's natures, and Horkos (Oath) who does more damage than any other to earthly men, when anyone, of his knowledge, swears to a false oath."