Knowing, by means of her supernatural powers, that Theseus was the king’s son, and fearing that her influence might be weakened by his presence, she poisoned the mind of the old king against the stranger, whom she represented as being a spy. It was accordingly arranged that Theseus should be invited to a banquet, and a strong poison mixed with his wine.

Now Theseus had resolved to reveal himself at this feast to the father whom he yearned to embrace. Before tasting the wine he put his plan into execution, and drew out his sword so that the eyes of the king might rest upon it. When Aegeus beheld once more the well-known weapon which he had so often wielded, he knew that it was his son who stood before him. He warmly embraced him, presented him as his heir to his courtiers and subjects, and then, no longer able to endure the sight of Medea, he banished her for ever from his dominions.