"Eunomia is extremely popular in Greek literature (Rudhardt, 1999: 97-104; Ostwald, 1969: 62-65). Her earliest appearance is as one of the Horai (Seasons), along with Dike and Eirene, in Hesiodos’ Theogonia (901-902). While several fifth century lyric poets followed this genealogy (Bakkhylides 14.59; Pindaros, Olympionike 9.22-24, 13.6-8), in the sixth century, Alkmanos referred to Eunomia (along with Peitho and Tykhe) as the daughter of Promatheia (Forethought) (Alkmanos fr. 64 Davies, PMGF). The noun eunomia, εὐνομία, stems from the verb εὐνομέομαι, meaning to have good laws (LSJ9 s.v. εὐνομέομαι; Rosler 2005, 233-236). Eunomia refers not just to the condition of having good laws, but adherence to those laws. In Sophokles’ Aias, for example, eunomia means loyalty to divine law (Sophokles, Aias 713; see also Homeros, Odysseia 487). In the seventh century, the elegiac poet Tyrtaios of Sparta connected this divine law with human law, when he eulogised eunomia as the divine right by which kings rule (Tyrtaios frs. 1-4 West, IE2).
In a democratic polis, such as Athens, eunomia also refers to the citizen’s obeisance to the laws (nomos), which creates good order (Ostwald, 1969: 62-65; Andrewes, 1938: 90). At the beginning of the sixth century, the Athenian statesman Solon (fr. 4.31-38 West, IE2) eulogised Eunomia as a civic virtue: My soul calls on me to teach these things to the Athenians: that Disnomia (Lawlessness) brings countless evils to the city, while Eunomia makes all things appear well ordered and proper, and often locks up the feet of criminals. She softens the rough, shrinks excess, lessens pride, withers the budding flowers of sin, sets straight crooked judgments, and soothes the actions of the arrogant. She shrinks the effects of discord and the troubling wrath of quarrel; it is through her that all affairs of men are proper and prudent.
Perhaps as a result of her Spartan roots, eunomia retained an aristocratic connotation at Athens. Pindaros invoked her as the guardian of Aitna (Pindaros, Nemeonike 9.29) , Korinthos (Olympionike 13.6), Opos (Olympionike 9.16, where Eunomia Soteira [Saviour] is connected with Themis), and Aigina (Isthmionike 5.22), all cities in which oligarchic systems prevailed. The fifth century Athenian conception of aristocratic eunomia as the opposite of democratic isonomia (equality of rights: Raaflaub, 1996) may have also derived from Eunomia’s monarchical Spartan background, through the influence of the pro-Spartan oligarchs at Athens (Ostwald, 1969: 65). … Yet the role of Eunomia as a virtue that gave rise to civic prosperity is equally applicable to monarchic and democratic poleis. This nonpartisan virtue is invoked in the 7th-century Hymnos Homerikos eis Gen (30.11-15): Such men with Eunomia command a city of beautiful women. Much prosperity and Ploutos (Wealth) accompany them; their sons bear themselves proudly with youthful joy; and their daughters, with cheerful hearts in blossoming dances, play and frisk over soft flowers.In the early fifth century Bakkhylides said that Eunomia received Thaleia (Bounty) as her lot (Bakkhylides 13.186-187).
Not surprisingly, it is this prosperous Eunomia who is found on Meidian vases. On a squat lekythos, once in Paris, VP 43, dated to the last decade of the fifth century, Eunomia is actually shown with Thaleia. The hope for prosperity and other joys that come with good order is also reflected in Meidian vase paintings that picture Eunomia with Eudaimonia or Eutykhia (both of whom represent Prosperity) as well as Paidia (Play): … One might have expected Eunomia, who brings prosperity, to have been connected here with Eirene (Peace) and Opora (Harvest), personifications of (agricultural) prosperity in the circle of Dionysos. Hesiodos had joined Eunomia and Eirene together as Horai, along with Dike (Hesiodos, Theogonia 901-902). … Eunomia and Eirene never appear together, however, in the last quarter of the fifth century. In the fourth century, however, Eunomia and Dike shared an altar with Aidos (Reverence) (Pseudo-Demosthenes 25.35). The law court speech that mentions this altar emphasises Eunomia’s importance to the polis: “You must magnify Eunomia who loves what is right and preserves every city and every land” (Pseudo-Demosthenes 25.10-11). This speech is, in fact, the earliest evidence for the cult of Eunomia at Athens."
- Polis and personification in classical Athenian art by Amy C. Smith