The festival which was previously established there in honour of Melikerta used to be celebrated by night, and to be more like a religious mystery than a great spectacle and gathering.  Some writers assert that the Isthmian games were established in honour of Skeiron, and that Theseus wished to make them an atonement for the murder of his kinsman; for Skeiron was the son of Kanethus and of Henioche the daughter of Pittheus.  Others say that this festival was established in honour of Sinis, not of Skeiron.  Be this as it may, Theseus established it, and stipulated with the Corinthians that visitors from Athens who came to the games should have a seat of honour in as large a space as could be covered by a sail of the public ship which carried them, when stretched out on the ground.  This we are told by Hellanikus and Andron of Halikarnassus.

XXVI.  Besides this, according to Philochorus and other writers, he sailed with Herakles to the Euxine, took part in the campaign against the Amazons, and received Antiope as the reward for his valour; but most historians, among whom are Pherekydes, Hellanikus, and Herodorus, say that Theseus made an expedition of his own later than that of Herakles, and that he took the Amazon captive, which is a more reasonable story.  For no one of his companions is said to have captured an Amazon; while Bion relates that he caught this one by treachery and carried her off; for the Amazons, he says, were not averse to men, and did not avoid Theseus when he touched at their coast, but even offered him presents.  He invited the bearer of these on board his ship; and when she had embarked he set sail.  But one, Menekrates, who has written a history of the town of Nikaea in Bithynia, states that Theseus spent a long time in that country with Antiope, and that there were three young Athenians, brothers, who were his companions in arms, by name Euneon, Thoas, and Soloeis.  Soloeis fell in love with Antiope, and, without telling his brothers, confided his passion to one of his comrades.  This man laid the matter before Antiope, who firmly rejected his pretensions, but treated him quietly and discreetly, telling Theseus nothing about it.  Soloeis, in despair at his rejection, leaped into a river and perished; and Theseus then at length learned the cause of the young man’s death.  In his sorrow he remembered and applied to himself an oracle he had received from Delphi.  It had been enjoined upon him by the Pythia that whenever he should be struck down with special sorrow in a foreign land, he should found a city in that place and leave some of his companions there as its chiefs.  In consequence of this the city which he founded was called Pythopolis, in honour of the Pythian Apollo, and the neighbouring river was called Soloeis, after the youth who died in it.  He left there the brothers of Soloeis as the chiefs and lawgivers of the new city, and together, with them one Hermus, an Athenian Eupatrid.  In consequence of this, the people of Pythopolis call a certain place in their city the house of Hermes, by a mistaken accentuation transferring the honour due to their founder, to their god Hermes.