The Wealth of Nations by Part 5 Chapter 1 Page 245

In this manner lived Zeno of Elea, Protagoras, Gorgias, Hippias, and many others. As the demand increased, the schools both of philosophy and rhetoric became stationary; first in Athens, and afterwards in several other cities. The state, however, seems never to have encouraged them further than by assigning some of them a particular place to teach in, which was sometimes done, too, by private donors. The state seems to have assigned the Academy to Plato, the Lyceum to Aristotle, and the Portico to Zeno of Citta, the founder of the Stoics. But Epicurus bequeathed his gardens to his own school. Till about the time of Marcus Antonius, however, no teacher appears to have had any salary from the public, or to have had any other emoluments but what arose from the honoraries or fees of his scholars.

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