The next enterprise undertaken by Theseus far surpassed all his other feats of heroic daring, and secured to him the universal admiration and gratitude of his fellow-citizens. This was the slaying of the Minotaur, which put an end for ever to the shameful tribute of seven youths and seven maidens which was exacted from the Athenians every nine years.
The origin of this barbarous tribute was as follows: Androgeos, the youthful son of Minos, king of Crete, having been treacherously murdered by the Athenians, his father, anxious to avenge the death of his son, declared war against their king Aegeus, and conquered Athens and the villages in its vicinity. The conqueror henceforth compelled the Athenians to send to him every nine years a tribute of seven youths and seven maidens of the noblest families of the land, who became the prey of the Minotaur, a monster, half-man, half-bull, whose lair was in the wonderful labyrinth, constructed by Dædalus for the Cretan king.
When Theseus informed his father of his heroic determination, he was overwhelmed with grief, and endeavoured, by every means in his power, to shake his son's resolution, but, confident of success, Theseus assured his
father that he would slay the Minotaur and return home victorious.
It was customary for the vessel bearing its unhappy freight of human victims to use on this voyage black sails only; but Theseus promised his father that, should he return in safety, he would hoist white ones in their place.
Before leaving Athens Theseus, by the advice of an oracle, chose Aphrodite as his guardian and protectress, and accordingly offered up a sacrifice to her. When he arrived in the presence of king Minos, the goddess of Love inspired Ariadne, the beautiful daughter of the king, with an ardent attachment for the noble young hero. During a secret interview, in which a mutual confession of affection took place, Ariadne furnished him with a sharp sword and a clue of thread, the end of which she desired him to fasten at the entrance to the labyrinth and to continue to unwind it till he reached the lair of the Minotaur. Full of hope as to the successful issue of his undertaking, Theseus took leave of the kind maiden, after expressing his gratitude for her timely aid.
At the head of his companions he was now conducted by Minos to the entrance of the labyrinth. Strictly adhering to the injunctions of the fair Ariadne he succeeded in finding the Minotaur, whom, after a fierce and violent struggle, he defeated and killed; then carefully feeling his way, by means of the clue of thread, he led his companions safely out of the labyrinth. They then fled to their ship, taking with them the lovely maiden to whose affection for their deliverer they owed their safety.
Arrived at the island of Naxos, Theseus had a dream, in which Dionysus, the wine-god, appeared to him, and informed him that the Fates had decreed that Ariadne should be his bride, at the same time menacing the hero with all kinds of misfortunes should he refuse to resign her. Now Theseus, having been taught from his youth to reverence the gods, feared to disobey the wishes of Dionysus. He accordingly took a sad farewell of the
beautiful maiden who so tenderly loved him, and left her on the lonely island, where she was found and wooed by the wine-god.
Theseus and his companions felt keenly the loss of their benefactress, and in their grief at parting with her, forgot that the ship still bore the black sails with which she had left the Attic coast. As she neared the port of Athens, Aegeus, who was anxiously awaiting the return of his son on the beach, caught sight of the vessel with its black sails, and concluding that his gallant son had perished, threw himself in despair into the sea.