After the death of Hippolyte Theseus sought the hand of Phædra, the sister of his former bride Ariadne, to whom he became united. For some years they lived happily together, and their union was blessed by the birth of two sons. During this time Hippolytus, the son of the Amazonian queen, had been absent from home, having been placed under the care of the king's uncles in order to be educated. When, having grown to manhood, he now returned to his father's palace, his young stepmother, Phædra, fell violently in love with him; but Hippolytus failed to return her affection, and treated her with contempt and indifference. Filled with rage and despair at his coldness Phædra put an end to her existence; and when she was discovered by her husband she held in her hand a letter, accusing Hippolytus of being the cause of her death, and of having conspired against the honour of the king.
Now Poseidon had upon one occasion promised to grant Theseus whatever request he should demand; he therefore called upon the sea-god to destroy Hippolytus, whom he cursed in the most solemn manner. The father's awful malediction fell but too soon upon his innocent son; for, as the latter was driving his chariot along the sea-shore, between Troezen and Athens, a
monster, sent by Poseidon, rose out of the deep, and so frightened the horses that they became altogether unmanageable. As they rushed on in their mad career the chariot was dashed to pieces, and the unfortunate youth, whose feet had become entangled in the reins, was dragged along until life was nearly extinct.
In this condition he was found by the unhappy Theseus, who, having ascertained the true facts of the case from an old servant of Phædra, had hastened to prevent the catastrophe. But he arrived too late, and was only able to soothe the last moments of his dying son by acknowledging the sad mistake which he had committed, and declaring his firm belief in his honour and innocence.
After these events Theseus was persuaded by his friend Pirithöus, who had also about this time lost his young wife, Hippodamia, to join him in a journey through Greece, with the object of carrying off by force the most beautiful maidens whom they should chance to meet.
Arrived at Sparta they beheld, in the temple of Artemis, Helen, the daughter of Zeus and Leda, who was engaged in performing sacred dances in honour of the goddess. Although the maiden was only nine years old the fame of her beauty, which was destined to play so important a part in the history of Greece, had already spread far and wide. Theseus and Pirithöus forcibly abducted her, and then having cast lots for her, she fell to Theseus, who placed her under the charge of his mother Æthra.
Pirithöus now requested Theseus to assist him in his ambitious scheme of descending to the lower world and carrying off Persephone, the queen of Hades. Though fully alive to the perils of the undertaking Theseus would not forsake his friend, and together they sought the gloomy realm of Shades. But Aïdes had been forewarned of their approach, and scarcely had the two friends set foot within his dominions when, by his orders, they were seized, bound with chains, and secured to an enchanted rock at the entrance of Hades. Here the two
friends languished for many years, until Heracles passed by in his search for Cerberus, when he released Theseus; but in obedience to an injunction of the gods, left Pirithöus to endure for ever the punishment of his too daring ambition.
While Theseus was imprisoned in the under world Castor and Pollux, the brothers of Helen, invaded Athens, and demanded the restoration of their young sister. Seeing his country threatened with the horrors of warfare, an Athenian citizen named Academus, who knew of Helen's place of concealment, repaired to the camp of the Dioscuri, and informed them where they would find her. Æthra at once resigned her charge, whereupon the brothers took leave of Athens, and, accompanied by Helen, returned to their native country.
But the prolonged absence of Theseus gave rise to other troubles of a more serious character. Thinking the opportunity favourable for a revolt, a faction, headed by Menesthius, a descendant of Erechtheus, arrogated to themselves supreme power, and seized the reins of government.