Histories

He went then to Delphi [22.5167,38.4917] (Perseus) Delphi, and asked the oracle if he should cast Adrastus out, but the priestess said in response: “Adrastus is king of Sikyon [22.725,37.9833] (Perseus)Sicyon, and you but a stone thrower.” When the god would not permit him to do as he wished in this matter, he returned home and attempted to devise some plan which might rid him of Adrastus. When he thought he had found one, he sent to Boeotian Thebes saying that he would gladly bring Melanippus son of Astacus into his country, and the Thebans handed him over.

When Cleisthenes had brought him in, he consecrated a sanctuary for him in the government house itself, where he was established in the greatest possible security. Now the reason why Cleisthenes brought in Melanippus, a thing which I must relate, was that Melanippus was Adrastus' deadliest enemy, for Adrastus had slain his brother Mecisteus and his son-in-law Tydeus.

Having then designated the precinct for him, Cleisthenes took away all Adrastus' sacrifices and festivals and gave them to Melanippus. The Sicyonians had been accustomed to pay very great honor to Adrastus because the country had once belonged to Polybus, his maternal grandfather, who died without an heir and bequeathed the kingship to him.