According to the myth, every year seven Athenian boys and seven Athenian girls were to be sent to Crete to be devoured by the Minotaur, a half-man, half-bull monster that lived in the Labyrinth created by Daedalus. On the third occasion, Theseus volunteered to slay the monster. He took the place of one of the youths and set off with a black sail, promising to his father, Aegeus, that if successful he would return with a white sail. Like the others, Theseus was stripped of his weapons when they sailed. On his arrival in Crete, Ariadne, King Minos’ daughter, fell in love with Theseus and, on the advice of Daedalus, gave him a ball of thread, so he could find his way out of the Labyrinth. That night, Ariadne escorted Theseus to the Labyrinth, and Theseus promised that if he returned from the Labyrinth he would take her with him.
As soon as Theseus entered the Labyrinth, he tied one end of the string to the door post and brandished his sword which he had kept hidden from the guards inside his tunic. He followed Daedalus’ instructions given to Ariadne; go forwards, always down and never left or right. Theseus came to the heart of the Labyrinth and also upon the sleeping Minotaur. The beast awoke and a tremendous fight then occurred. Theseus overpowered the Minotaur with his strength and stabbed the beast in the throat with his sword. After decapitating the beast, Theseus used the string to escape the Labyrinth and managed to escape with all of the young Athenians and Ariadne as well as her younger sister Phaedra. Then he and the rest of the crew fell asleep on the beach. Athena wakes Theseus and tells him to leave early that morning. She also tells Theseus to leave Ariadne and Phaedra on the beach. Stricken with distress, Theseus forgot to put up the white sails instead of the black ones, so the king - his father - committed suicide. Dionysus later saw Ariadne crying out for Theseus and took pity on her and married her.