XENOPHON

And Cleocritus, the herald of the initiated, a man with a very fine voice, obtained silence and said: (Xenophon, Hellenica, Book II, Chapter 4, Section 20, in the Loeb Classical Library edition, translated by Carleton L. Brownson.)

The right course, indeed, would have been for us not to take up arms against one another in the beginning, since the tradition is that the first strangers to whom Triptolemus, our ancestor, revealed the mystic rites of Demeter and Kore were Heracles, your state’s founder, and the Dioscuri, your citizens; and further, that it was upon Peloponnesus that he first bestowed the seed of Demeter’s fruit.
(Xenophon, Hellenica VI, 3)