sentences:  Pittheus understanding the oracle on Aegeus' inquiry whether or not he was going to ever have children, had made the Athenian king drunk, who ended up spending the night with his daughter Aethra.Aethra had lain with Poseidon earlier that evening, so when Theseus was born he became Aegeus' stepson.According to Plutarch, Pittheus merely spread the report of her daughter's copulation with the god so that Theseus might be regarded as the son of Poseidon, who was much revered at Troezen.