ERIS was the personification of strife, discord and hatred. She lurked around the battlefield delighting in bloodshed and suffering.
Because of Eris' disagreeable nature she was the only one of the gods not invited to the wedding of Peleus and Thetis. She came anyway and was refused admittance. Furious, Eris threw a golden apple, inscribed 'To the fairest', among the guests. Three goddesses claimed it and the result of the judgement led directly to the Trojan War.

Eris goddess of strife and Enyo goddess of war were one nad the same in early literature, but later authors described them as two separate and distinct goddesses.

Parents

(1) NYX (Theogony 225)The winged Goddess of Night
(2) ZEUS & HERA (called the sister of Ares) (Iliad 4.441, Quintus Smyrnaeus 10.51)
(3) EREBOS & NYX (Hyginus Pref)


Offspring

(1) PONOS, LETHE, LIMOS, THE ALGEA, THE HYSMINAI, THE MAKHAI, THE PHONOI, THE ANDROKTASIAI, THE NEIKEA, THE LOGOI, THE AMPHILOGIAI, DYSNOMIA, ATE, HORKOS (no father) (Theogony 226)
(2) ENYALIOS (Enyo by Ares) (Eustathius on Homer 944 &/or Roman Antiquities)

"Also deadly Nyx bare .. hateful Geras and hard-hearted Eris." -Theogony 225

"But abhorred Eris 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 (Grievances), the 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 " –Theogony 226

"For ere this [the arrival of Pandora on the earth] the tribes of men lived on earth remote and free from ills and hard toil and heavy sickness which bring the Fates upon men; for in misery men grow old quickly. But the woman [Pandora] took off the great lid of the jar with her hands and scattered all these [the harmful daimones offspring of Eris] and her thought caused sorrow and mischief to men. Only Elpis (Hope) remained there in an unbreakable home within under the rim of the great jar, and did not fly out at the door; for ere that, the lid of the jar stopped her, by the will of Aegis-holding Zeus who gathers the clouds. But the rest, countless plagues, wander amongst men; for earth is full of evils and the sea is full. Of themselves diseases come upon men continually by day and by night, bringing mischief to mortals silently; for wise Zeus took away speech from them. So is there no way to escape the will of Zeus." -Works & Days 54-105


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ERIS GODDESS OF THE STRIFE OF WAR

Eris was insatiable in her desire for bloodshed, and after all the other gods had withdrawn from the battlefield, she still remained rejoicing over the havoc that had been made.

"Ares drove these [the Trojans] on, and the Akhaians grey-eyed Athene, and Phobos (Terror) drove them, and Deimos (Fear), and Eris (Hate) 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." -Iliad 4.441

"Their fighting work [was woken by] ... man-slaughtering Ares, and Eris, whose wrath is relentless." -Iliad 5.518

"After the Olympians merged in the men's company [on the battlefield] strong Eris, defender of peoples, burst out." -Iliad 20.48

"Zeus sent down in speed to the fast ships of the Akhaians the wearisome goddess Eris, holding in her hands the portent of battle. She took her place on the huge-hollowed black ship of Odysseus which lay in the middle, so that she could cry out to both flanks ... There the goddess took her place, and cried out a great cry and terrible and loud, and put strength in all the Akhaians hearts, to go on tirelessly with their fighting of battles." -Iliad 11.3

"The pressure held their [the battling warriors] heads on a line, and they whirled and fought like wolves, and Eris, the Lady of Sorrow, was gladdened to watch them. She alone of all the immortals attended this action [the other gods had been commanded by Zeus to withdraw from this stage of the Trojan War]." -Iliad 11.73

"Dread Eris, marshalling the slaughter of fighting men, cruel spirit, who took the senses and perception out of those fighters who tried to fight in the face of Zeus' son, [Ares] the War God, and the souls of these went under the ground, to the house of Hades." -Shield of Herakles 148

"The other [Eris] is hateful. The two Erites have separate natures. There is one Eris who builds up evil war, and slaughter. She is harsh; no man loves her, but under compulsion and by will of the immortals, men promote this rough Eris (Strife)." -Works and Days 11

"Her [the Amazon Penthesilea] strong right hand laid hold on a huge halberd, sharp of either blade, which terrible Eris gave to Ares' child to be her Titan weapon in the strife [of the Trojan War] that raveneth souls of men." -Quintus Smyrnaeus 1.158

"As flasheth far through war-hosts Eris, waker of onset-shouts." -Quintus Smyrnaeus 1.180

"Who is so aweless - daring, who is clad in splendour-flashing arms: nay, surely she shall be Athene, or the mighty-souled Enyo - haply Eris." -Quintus Smyrnaeus 1.365

"And there [depicted on the shield of Akhilleus] were man-devouring wars, and all horrors of fight ... Phobos (Panic) was there, and Deimos (Dread), and ghastly Enyo with limbs all gore-bespattered hideously, and deadly Eris (Strife)." -Quintus Smyrnaeus 5.25

"The Kentauroi round the hall of Pholos: goaded on by Eris (Strife) and wine, with Herakles the monsters fought." -Quintus Smyrnaeus 6.274

"Hard by them [Neoptolemos & Eurypylos in combat] stood Enyo, spurred them on ceaselessly: never paused they from the strife ... Eris (Strife) incarnate watched and gloated o'er them." -Quintus Smyrnaeus 8.186

"So man to man dealt death [in the Trojan War]; and joyed the Keres (Fates) and Moros (Doom), and fell Eris (Strife) in her maddened glee shouted aloud, and Ares terribly shouted in answer, and with courage thrilled the Trojans, and with panic fear the Greek." -Quintus Smyrnaeus 8.324

"The Keres (Deaths) exulted over them [the men dying in battle]; deadly Eris (Strife) shrieked out a long wild cry from host to host. With blood of slain men dust became red mire." -Quintus Smyrnaeus 9.145

"But the sons of men fought on, and slew; and Eris (Strife incarnate) gloating watched." -Quintus Smyrnaeus 9.324

"To one place Eris (Strife incarnate) drew them all, the fearful Battle-queen, beheld of none, but cloaked in clouds blood-raining: on she stalked swelling the mighty roar of battle, now rushed through Troy's squadrons, through Akhaia's now; Phobos (Panic) and Deimos (Fear) still waited on her steps to make their father's [Ares'] sister glorious. From small to huge that Fury's stature grew; her arms of adamant were blood-besprent, the deadly lance she brandished reached the sky. Earth quaked beneath her feet: dread blasts of fire flamed from her mouth: her voice pealed thunder-like kindling strong men. Swift closed the fronts of fight drawn by a dread Power to the mighty work." -Quintus Smyrnaeus 10.51

"The Akhaians pressed hard on the Trojans even unto Troy. Yet these charged forth -- they could not choose but so, for Eris (Strife) and deadly Enyo in their midst stalked, like the fell Erinnyes to behold, breathing destruction from their lips like flame. Beside them raged the ruthless-hearted Keres (Fates) fiercely: here Phobos (Panic-fear) and Ares there stirred up the hosts: hard after followed Deimos (Dread)." -Quintus Smyrnaeus 11.7

"The black Keres (Fates) joyed to see their conflict [the Greeks & The Trojans], Ares laughed, Enyo yelled horribly. With corpses earth was heaped, with torrent blood was streaming: Eris (Strife incarnate) o'er the slain gloated." -Quintus Smyrnaeus 11.151

"Still on Troy's folk the Argives wreaked their wrath [when Troy was sacked], and battle's issues Eris (Strife Incarnate) held." -Quintus Smyrnaeus 13.562

“Eris infernal monster” - Greek Lyric II Alcman Frag 146

"With the gluttonous mouth of Eris (Strife) will one day arm for battle against me." -Greek Lyric III Ibycus Frag 311

“[Depicted on the chest of Cypselus at Olympia] Aias is fighting a duel with Hektor, according to the challenge, and between the pair stands Eris in the form of a most repulsive woman. Another figure of Eris is in the sanctuary of Ephesian Artemis; Kalliphon of Samos included it in his picture of the battle at the ships of the Greeks.” –Pausanias 5.19.1

"Here [at the porch and entrance to Hades] dwells ... lunatic Eris whose viperine hair is caught up with a headband soaked in blood." -Aeneid 6.280

"Here [in battle] Eris strides exulting in her torn mantle." -Aeneid 8.702

“[Medea casts a spell of discord over Jason's helmet] 'Come now,’ she says, ‘take again the crested helm which Discordia [Eris] haled but now in her death-bringing hand. When thou hast turned the sods [sowing the Drakon's teeth], hurl this into the midst of the harvest [of armed earth-born men]: straightway shall all the troop turn upon themselves in rage, and my father himself shall cry aloud in wonder, and turn his gaze mayhap on me.” –Valerius Flaccus 7.468

“Not long since that first of goddesses [Dike goddess of Justice] had no throne even among men, but noisy riots and raging ruin of destroying War (Ares) and Strife (Eris), giver of pain, nurse of tearful wars, consumed the unhappy race of the creatures of a day.” –Halieutica 2.654

“And Enyo, revelling in the drunkenness of unmixed blood [at the slaughter of the Sack of Troy], danced all night throughout the city, like a hurricane, turbulent with the waves of the surging war. And therewithal Eris (Strife) lifted her head high as heaven and stirred up the Argives; since even bloody Ares, late but even so, came and brought to the Danaans the changeful victory in war.” –Tryphiodorus 560

“To both armies alike [those of Kadmos of Thebes & the Aionians] Eris (Strife) joined Enyo and brought forth tumult.” –Dionysiaca 5.40

“[When the monster Typhoeus & Zeus engaged in battle] Eris (Strife) was Typhon’s escort in the mellay, Nike (Victory) led Zeus into battle … impartial Enyo held equal balance between the two sides, between Zeus and Typhon, while the thunderbolts with booming shots revel like dancers in the sky” –Dionysiaca 2.358 & 2.475

“A dream came to Bakkhos – Eris (Discord) the nurse of war, in the shape of Rheia the loverattle goddess, seated in what seemed to be her lionchariot. Phobos (Rout) drove the team of this dreamchariot, in the counterfeit shape of Attis with limbs like his; he formed the image of Kybele’s charioteer, a softskinned man in looks with shrill tones like the voice of a woman. Gadabout Eris stood by the head of sleeping Bakkhos and reproached him with brawl-inciting voice:
‘You sleep, godborn Dionysos! Deriades [the Indian King] summons you to battle, and you make merry here! Stepmother Hera mocks you, when she sees your Enyo on the run, as you drag your army to dances! I am ashamed to show myself before Kronion, I shrink form Hera, I shrink from the immortals, because your doings are not worthy of Rheia. I avoid Ares, destroyer of the Titanes ... and I fear your sister still more .... flashhelm Pallas, because Athena too blames Bakkhos idle, the woman blames the man! Thyrsos yielded to goatskin, since once upon a time valiant Pallas holding the goatskin defended the gates of Olympos, and scattered the stormy assault of the Titanes, thus honouring the dexterous travail of her father’s head – but you disgrace the fruitful pocket in Zeus’s thigh! … The Virgin Archeress [Artemis] denounces Dionysos the dancer ... I shrink from Leto, still a proud braggart, when she holds up at me the arrow that defended her bed and slew Tityos the lustful giant. I am tortured also with double pain, when I see sorrowing Semele and proud Maia among the stars. You are not like a son of Zeus. You did not slay with an arrow threatening Otos and hightowering Ephialtes, no winged shaft of your destroyed Tityos, you did not kill that unhappy lover bold Orion, nor Hera’s guardian Argos, the cowkeeper, a son of the earth so fertile in evil, the spy on Zeus in his weddings with horned cattle! No, you weave your web of merriment with Stayphylos and Botrys, inglorious, unarmed, singing songs over the wine; you degrade the earthy generation of Satyroi, sine they also have touched the bloodless Bakkhanal dance and drowned all warlike hopes in their cups. There may be banquet after battle, there may be dancing after the Indian War in the palace of Staphylos; viols may let their voice be heard again after the victory in the field. But without hard work it is not possible to dwell in the inaccessible heavens. The road to the Blessed is not easy; noble deeds give the only path to the firmament of heaven by God’s decree. You too then, endure hardship of every kind. Hera for all her rancour foretells for you the heavenly court of Zeus.’
She spoke, and flew away. The god leapt from his bed, with the terrible sound of that threatening dream still in his ears [and returned to his war with the Indians].” –Dionysiaca 20.35

“Deathly Ares [in Dionysos’ war against the Indians] shouted as loud as nine thousand, with Eris (Discord) moving by his side to support him; in the battle he placed Phobos (Rout) and Deimos (Terror) to wait upon Deriades [the Indian King].” –Dionysiaca 32.175


from www.theoi.com/Khaos/Eris.html