Eris (mythology) in the context of "Eristic"

In Greek mythology, Harmonia (/hɑːrˈmoʊniə/; Ancient Greek: Ἁρμονία /harmoˈnia/, "harmony", "agreement") is the goddess of harmony and concord. Her Greek opposite is Eris and her Roman counterpart is Concordia. Harmonia is most well-known for her marriage to Cadmus and the many misfortunes that haunted her descendants, particularly those related to the fabled Necklace of Harmonia.

Orcus was a god of the underworld, punisher of broken oaths in Etruscan and Roman mythology. As with Hades, the name of the god was also used for the underworld itself. Eventually, he was conflated with Dis Pater and Pluto.

A temple to Orcus may once have existed on the Palatine Hill in Rome. It is likely that he was transliterated from the Greek daemon Horkos, the personification of oaths and a son of Eris.
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Eris (minor-planet designation: 136199 Eris) is the most massive and second-largest known dwarf planet in the Solar System. It is a trans-Neptunian object (TNO) in the scattered disk and has a high-eccentricity orbit. Eris was discovered in January 2005 by a Palomar Observatory–based team led by Mike Brown and verified later that year. It was named in September 2006 after the Greco–Roman goddess of strife and discord. Eris is the ninth-most massive known object orbiting the Sun and the sixteenth-most massive in the Solar System (counting moons). It is also the largest known object in the Solar System that has not been visited by a spacecraft. Eris has been measured at 2,326 ± 12 kilometres (1,445 ± 7 mi) in diameter; its mass is 0.28% that of the Earth and 27% greater than that of Pluto, although Pluto is slightly larger by volume. Both Eris and Pluto have a surface area that is comparable to that of Russia or South America.

Eris has one large known moon, Dysnomia. In February 2016, Eris's distance from the Sun was 96.3 AU (14.41 billion km; 8.95 billion mi), more than three times that of Neptune or Pluto. With the exception of long-period comets, Eris and Dysnomia were the most distant known natural objects in the Solar System until the discovery of 2018 AG37 and 2018 VG18 in 2018.

The Judgement of Paris is a story from Greek mythology, which was one of the events that led up to the Trojan War, and in later versions to the foundation of Rome.

Eris, the goddess of discord, was not invited to the wedding of Peleus and Thetis. In revenge, she brought a golden apple, inscribed, "To the fairest one", which she threw into the wedding. Three guests, Hera, Athena and Aphrodite, after some disputation, agreed to have Paris of Troy choose the fairest one. Paris chose Aphrodite, she having bribed him with the most beautiful mortal woman in the world, Helen of Sparta, wife of Menelaus. Consequently, Paris carried Helen off to Troy, and the Greeks invaded Troy for Helen's return. Eris's Apple of Discord (or her not being invited to the wedding in the first place) was thus the instrumental casus belli of the Trojan War.

In Greek mythology, Horkos (/ˈhɔːrkɒs/; Ancient Greek: Ὅρκος [hór.kos], lit. 'Oath') personifies the curse that is inflicted on any person who swears a false oath. According to Hesiod, Horkos was the son of Eris (Strife). He is one of the divine enforcers of oaths, which were an important part of the ancient Greek system of justice.

In Greek mythology, the Apple of Discord (Ancient Greek: μῆλον τῆς Ἔριδος) was a golden apple dropped by Eris, the goddess of strife, at the wedding of Peleus and Thetis. It sparked a vanity-fueled dispute among Hera, Athena, and Aphrodite that led to the Judgement of Paris and ultimately the Trojan War.

In common parlance, the "apple of discord" is the core, kernel, or crux of an argument, or a small matter that could lead to a bigger dispute.