Strabo, Geography

Before coming to Erythrae, one comes first to a small town Erae belonging to the Tëians; and then to Corycus, a high mountain, and to a harbor at the foot of it, Casystes, and to another harbor called Erythras, and to several others in order thereafter. The waters along the coast of Mt. Corycus, they say, were everywhere the haunt of pirates, the Corycaeans, as they are called, who had found a new way of attacking vessels; for, they say, the Corycaeans would scatter themselves among the harbors, follow up the merchants whose vessels lay at anchor in them, and overhear what cargoes they had aboard and whither they were bound, and then come together and attack the merchants after they had put to sea and plunder their vessels; and hence it is that we call every person who is a busybody and tries to overhear private and secret conversations a Corycaean; and that we say in a proverb:“
Well then, the Corycaean was listening to this,
”when one thinks that he is doing or saying something in secret, but fails to keep it hidden because of persons who spy on him and are eager to learn what does not concern them.