Diogenes Laertius Vitae philosophorum 8.1.3

[3] Now he was in Egypt when Polycrates sent him a letter of introduction to Amasis; he learnt the Egyptian language, so we learn from Antiphon in his book On Men of Outstanding Merit, and he also journeyed among the Chaldaeans and Magi. Then while in Crete he went down into the cave of Ida with Epimenides; he also entered the Egyptian sanctuaries, ¹ and was told their secret lore concerning the gods. After that he returned to Samos to find his country under the tyranny of Polycrates; so he sailed away to Croton in Italy, and there he laid down a constitution for the Italian Greeks, and he and his followers were held in great estimation; for, being nearly three hundred in number, so well did they govern the state that its constitution was in effect a true aristocracy (government by the best).