Ariadne.
Princess (I think she is a princess not sure) Adriane led Theseus through the labyrinth. It actually wasn't the string it was her she was 100% mortal but she could she through the mist (the mist makes sure mortals can't see monsters or anything) so she could find her the way through the labyrinth.
Theseus used a ball of thread/string to find his way out. This was given to him by the princess Ariadne.
A string that led through the Labyrinth.
The idea came from Daedalus, but it was Ariadne, one of the daughters of Minos, that gave the string to Theseus and instructed him on its use.
Ariadne gave a string to Theseus to guide his way into the labyrinth
Ariadne gave Theseus a roll of string so that once he had killed the Minotaur, he could find his way back out.
King Minos's daughter, Princess Ariadne of Crete.
Actually Theseus killed the Minotaur with his bare hands. The princess of Crete gave him the magic thread to find his way out of the Labyrinth.
Theseus used a ball of thread/string to find his way out. This was given to him by the princess Ariadne.
Ariadne helped Theseus by using Ariadne's String.
ANSWERTheseus was given a ball of thread by Princess Ariadne who told him to unravel it as he penetrated into the Labyrinth, so he knew the way out after he killed the Minotaur.
Theseus was beloved by a Princess of Crete, Ariadne, who helped him escape the Labyrinth.