In Greek mythology, Argia (Argeia) is a daughter of King Adrastus of Argos and Amphithea, daughter of Pronax. Married to the exiled Theban Polynices when Adrastus matched his daughters to the lion and the boar, she became mother of Thersander (and, in some lists, Adrastus and Timeas), linking the Argive house of the Seven against Thebes to the Epigoni who later took the city.
Adapted from Wikipedia, "Argia (daughter of Adrastus)" · CC BY-SA 4.0
I.Marriage and the Seven
Apollodorus numbers Argia first among Adrastus's three daughters by Amphithea, before Deipyle and Aegialia. When Polynices and Tydeus fought by night in Adrastus's palace, the king recalled Apollo's oracle and wed Argia to the lion-shielded Theban and Deipyle to the boar-shielded Aetolian, then mustered the Seven to restore both sons-in-law.
Hyginus and related genealogies make Thersander — leader among the Epigoni and later a Mycenaean ally toward Troy — her son by Polynices. Through that son Argia bridges the failed first expedition and the second war that won Thebes.
II.Reception
A scholiast on Homer places Argia among those who came to Oedipus's funeral. Boccaccio includes her in De Mulieribus Claris; Dante places her in Limbo. Euripides' Phoenician Women and Suppliants treat the wedding without always naming her. The atlas id argia-adrastid marks Adrastus's daughter, not other women named Argia/Argeia.