Greek Stoic philosopher, Chrysippus c. 281/77-208/4 BC. Roman copy of a lost Greek original of the late 3rd or 2nd century BC. Chrysippus developed the Stoic school of philosophy founded in Athens in 280 BC. by Zeno. As an ethicist, he maintained that the life of human happiness and the life of virtue are one and the same. He seems to have thought virtue is best understood as related essentially, if not entirely reducible, to wisdom.