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In Greek mythology, Thestius /ˈθɛsəs, ˈθɛstiəs/ (Ancient Greek: Θέστιος) was a king of Pleuronians in Aetolia.[1][2] He is not to be confused with Thespius, who was sometimes referred to as "Thestius".[3] The patronymic "Thestias" may refer to one of his daughters, Leda or Althaea,[4][5] and "Thestiades" to his son Iphiclus.[6]


Thestius was the son either of Ares by Demonice[7] or Pisidice,[8] or of Agenor (son of Pleuron)[9] and possibly Epicasta. He was the father of Iphiclus with Leucippe,[10] or Deidameia, daughter of Perieres,[11] or else with Eurythemis, daughter of Cleoboea and mother of his other children, Althaea, Eurypylus, Evippus, Hypermnestra, Leda and Plexippus.[12] In one source though, the mother of Althaea and Leda is Laophonte, daughter of Pleuron.[13] Other sons of Thestius were Cometes and Prothous,[14] Aphares[15] and Calydon.[8]

Relation Name Sources
Alcman Pherecydes Bacchy. Sch. on Apollon. Ovid Apollod. Plut. Hyg. Pau.
Parent(s) Ares and Demonice
Ares and Pisidice
Wife Deidameia
Leucippe [16]
Children Iphiclus


Thestius was allied with Tyndareus and Icarius against Hippocoon.[17] According to Strabo, when Tyndareus and his brother Icarius, after being banished by Hippocoön from their homeland, went to Thestius, the king of the Pleuronii. The king helped the two brothers to acquire possession of much of the country on the far side of the Acheloüs on condition that they should receive a share of it. Tyndareus, however, went back home, having married Leda, the daughter of Thestius, whereas Icarius stayed on, keeping a portion of Acarnania, and by Polycaste, the daughter of Lygaeus, begot both Penelope and her brothers.[2]

In a rare variant of the myth by Plutarch, the river Achelous in Aetolia was formerly called after Thestius. This Thestius who upon some domestic discontent traveled as far as Sicyon, where he had resided for some time, returned to his native home. But finding there his son Calydon and his mother [i.e. Pisidice] both upon the bed together, believing him to be an adulterer, slew his own child by a mistake. But when he beheld the unfortunate and unexpected fact he had committed, he threw himself into the river Axenos, which from thence was afterwards called Thestius.[8]


  1. ^ Aeschylus. Libation Bearers 602. English translation by Herbert Weir Smyth, Ph. D. in two volumes. 2. Libation Bearers. Herbert Weir Smyth, Ph. D. Cambridge, Massachusetts. Harvard University Press. 1926.
  2. ^ a b Strabo. Geography 10.2.24 Edition by H.L. Jones. Cambridge, Massachusetts: Harvard University Press; London: William Heinemann, Ltd. 1924.
  3. ^ Pausanias, Description of Greece, 9. 27. 7
  4. ^ Aeschylus, Libation-Bearers, 606
  5. ^ Euripides, Iphigenia in Aulis, 49
  6. ^ Apollonius Rhodius, Argonautica, 1. 261
  7. ^ Pseudo-Apollodorus, Bibliotheca 1. 7. 7
  8. ^ a b c Plutarch. De fluviis 22.1 Translated from the Greek by several hands. Corrected and revised by. William W. Goodwin, PH. D. Boston. Little, Brown, and Company. Cambridge. Press Of John Wilson and son. 1874. 5.
  9. ^ Pausanias, Description of Greece, 3. 13. 8
  10. ^ Hyginus, Fabulae, 14
  11. ^ Scholia on Apollonius Rhodius, Argonautica, 201
  12. ^ Pseudo-Apollodorus, Bibliotheca 1. 7. 10
  13. ^ Alcman. Fragment 15 as cited in Scholiast on Apollonius of Rhodes. Argonautica, 1.146
  14. ^ Note that we must not confuse Toxeus, the son of Thestius from his nephew who was also called Toxeus, the son of Althaea and Oeneus.
  15. ^ Bacchylides. Epinician Odes 125ff
  16. ^ Leda's and Hypermnestra's mother might be Leucippe as well because there was no other woman mentioned as the wife of Thestius other than Leucippe in this text.
  17. ^ Pseudo-Apollodorus, Bibliotheca 3. 10. 5