Arriving in Crete, the princess Ariadna fell in love with him and proposed to Teseo help him defeat his brother (Minotauro) in exchange for him to take her back to Athens and became his wife. Teseo accepted.
The aid of Ariadna consisted of giving Theseus a ball of thread that this tied by one end to the door of the labyrinth. Another version indicates that the aid of Ariadna consisted of a crown that emitted a glow and Dionysus had given him as a wedding gift or it could be the same crown Amphitrite had given him during the trip to Crete.
Theseus and entered the maze to find the Minotaur, which killed punches. Then he picked up the thread and was able to escape from the labyrinth and immediately, accompanied by the rest of Athenians and Ariadne, he sailed back to Athens, after sinking ships Cretans to prevent a possible persecution.