Plutarch, Theseus
Bernadotte Perrin, Ed.

Accordingly, when the time came for the third tribute, and it was necessary for the fathers who had youthful sons to present them for the lot, fresh accusations against Aegeus arose among the people, who were full of sorrow and vexation that he who was the cause of all their trouble alone had no share in the punishment, but devolved the kingdom upon a bastard and foreign son, and suffered them to be left destitute and bereft of legitimate children. [2] These things troubled Theseus, who, thinking it right not to disregard but to share in the fortune of his fellow-citizens, came forward and offered himself independently of the lot. The citizens admired his noble courage and were delighted with his public spirit, and Aegeus, when he saw that his son was not to be won over or turned from his purpose by prayers and entreaties, cast the lots for the rest of the youths. [3]

Hellanicus, however, says that the city did not send its young men and maidens by lot, but that Minos himself used to come and pick them out, and that he now pitched upon Theseus first of all, following the terms agreed upon. And he says the agreement was that the Athenians should furnish the ship, and that the youths should embark and sail with him carrying no warlike weapon, and that if the Minotaur was killed the penalty should cease. [4]

On the two former occasions, then, no hope of safety was entertained, and therefore they sent the ship with a black sail, convinced that their youth were going to certain destruction; but now Theseus encouraged his father and loudly boasted that he would master the Minotaur, so that he gave the pilot another sail, a white one, ordering him, if he returned with Theseus safe, to hoist the white sail, but otherwise to sail with the black one, and so indicate the affliction. [5]

Simonides, however, says¹ that the sail given by Aegeus was not white, but ‘a scarlet sail dyed with the tender flower of luxuriant holm-oak,’ and that he made this a token of their safety. Moreover, the pilot of the ship was Phereclus, son of Amarsyas, as Simonides says; [6] but Philochorus says that Theseus got from Scirus of Salamis Nausithous for his pilot, and Phaeax for his look-out man, the Athenians at that time not yet being addicted to the sea, and that Scirus did him this favour because one of the chosen youths, Menesthes, was his daughter's son. And there is evidence for this in the memorial chapels for Nausithous and Phaeax which Theseus built at Phalerum near the temple of Scirus, and they say that the festival of the Cybernesia, or Pilot's Festival, is celebrated in their honor.