Thestius was the father of Iphiclus[8] by Leucippe[9] or Eurythemis, daughter of Cleoboea, who was the mother of his other children, Althaea,[10] Eurypylus, Evippus, Hypermnestra, Leda and Plexippus.
[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.
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.