"Ancient Greek biographer" . "Diogenes Laertius"@en . "Diogenes Laertius (/da\u026A\u02C8\u0252d\u0292\u0268ni\u02D0z le\u026A\u02C8\u025Cr\u0283i\u0259s/; Greek: \u0394\u03B9\u03BF\u03B3\u03AD\u03BD\u03B7\u03C2 \u039B\u03B1\u03AD\u03C1\u03C4\u03B9\u03BF\u03C2, Diogen\u0113s Laertios; fl. c. 3rd century CE) was a biographer of the Greek philosophers. Nothing is definitively known about his life, but his surviving Lives and Opinions of Eminent Philosophers is a principal source for the history of Greek philosophy."@en .