Diogenes Laertius
A compiler whose own life is obscure
Diogenes Laertius is generally placed in the third century CE, but his birthplace, personal circumstances, and philosophical allegiance remain uncertain. His name should not be confused with that of Diogenes the Cynic, one of the much earlier figures described in his collection. A detailed itinerary or account of his education would go beyond the surviving evidence.
His substantial achievement is a ten-book history organized around philosophers’ lives and teachings. He collected material from earlier writings, many now lost, often through intermediate sources. This makes his work an important witness to the transmission of Greek philosophy while also complicating the authority of individual reports. The compiler preserves a tradition whose stages cannot always be reconstructed.
Lives, sayings, and schools
The collection sets doctrines beside memorable actions, sayings, succession lists, and stories about character. It asks readers to encounter philosophy as a way of living and as an inheritance passed between teachers and pupils. Yet an anecdote that neatly embodies a doctrine need not record an event exactly as it occurred.
The introduction itself debates the origins of philosophy and asserts Greek precedence. That argument should be read as a position within ancient cultural competition, not as a neutral modern account of the history of thought.
The collection in this library
C. D. Yonge’s translation ranges from early sages such as Thales and Solon through Plato, Aristotle, Stoics, Cynics, and others. The final book treats Epicurus at length and includes letters, among them the letter to Herodotus on nature. A life thus becomes a setting in which substantial philosophical writing survives.
Yonge’s prefatory account contains conjectures about the author and his audience. Keep those later scholarly proposals separate from the ancient text and from what can confidently be established about its compiler.
Reading different kinds of evidence
Ask whether a passage is a reported saying, an attributed document, a summary of doctrine, or an anecdote. Each makes a different claim on the reader’s confidence.
Compare how a philosopher’s conduct is made to fit—or strain against—the teaching ascribed to that person. The collection is useful both for what it transmits and for showing how intellectual reputations are formed. Its variety is a reason to read discriminately, rather than either trusting or dismissing every report alike.