Institutio Oratoria

He, thanks to his length of days, for he lived to a hundred and nine, flourished as the contemporary of many rhetoricians, was consequently the rival of those whom I have just mentioned, and lived on to survive Socrates.

In the same period flourished Thrasymachus of Chalcedon, Prodicus of Ceos, Protagoras of Abdera, for whose instructions, which he afterwards published in a text-book, Euathlus is said to have paid 10,000 [*](About £312.) denarii, Hippias of Elis and Alcidamas of Elaea whom Plato [*](Phaedr. 261 D. ) calls Palamedes.