he knew by his skill in the stars while it was yet winter that there would be a great harvest of olives in the coming year; so, having a little money, he gave deposits for the use of all the olive-presses in Chios and Miletus, which he hired at a low price because no one bid against him. When the harvest-time came, and many were wanted all at once and of a sudden, he let them out at any rate which he pleased, and made a quantity of money.
Now, this is total bull because the stars don't predict weather. Reading chicken entrails and the like was popular back then and they had lots of other wacky beliefs, but the idea that they traded on them and prospered is clearly a self-serving lie. Today, we have active mutual fund managers who claim to outperform indices even though this has never been the case, so I guess every age has its own myths.