3. Of Chaeroneia, a Stoic philosopher, nephew of Plutarch, and one of the instructors of the emperor Marcus Aurelius (Jul. Capitolin. Vita M. Antonin. Philos. ; Suid. s. v. Μάρκος; comp. Antonin. De Rebus suis, 1.9).
According to Suidas it was during the reign, and indeed in the latter part of the reign of Marcus, and when Sextus was teaching at Rome, that the emperor attended his instructions. He is perhaps the " Sextus the Philosopher," mentioned by Syncellus as flourishing under the reign of Hadrian.