The Stoic school he founded had a series of leaders, or “scholarchs,” and a set of characteristic core doctrines, but students were also encouraged to think for themselves. After Zeno died, Cleanthes, one of his students, who had formerly been a boxer and watered gardens at night to earn a living, became head of the Stoic school; he was followed by Chrysippus, one of the most acclaimed intellectuals of the ancient world. Between them, these three developed the original doctrines of the Stoic school.
