Public Domain. Courtesy of Wikipedia. "School of Athens," by Raffaello Sanzio, 1509.
Hint (from Lucian via Giles Laurén's The Stoic's Bible)
"If Aristotle calls me to the Lyceum, I shall go with him; if Plato calls me to the Academy, I shall come; if Zeno calls, I shall spend my time in the Stoa; if ... calls, I shall hold my tongue. Demonax rose and said: ... calls.
Demonax. LUCIAN I. Demonax. p.153.