An idea from Lives of the Eminent Philosophers

The story goes that Zeno, a shipwrecked merchant, asked a bookseller where men like Socrates could be found. The bookseller pointed at Crates, who was walking past: “Follow that man.” Zeno later taught in the Painted Porch, the Stoa, so his students were called Stoics.

From Lives of the Eminent Philosophers by Diogenes Laertius