Diogenes Laertius: Lives of the Eminent Philosophers
The Ancient Biographies of Socrates, Plato, Aristotle, Zeno, Epicurus and the Greek Schools

About Diogenes Laertius

Diogenes Laertius was a Greek writer who probably lived in the first half of the third century AD. Nothing is known about his life, apart from his authorship of the Lives of the Eminent Philosophers. He also wrote poems, most of them now lost.