Diogenes Laërtius (/daɪˌɒdʒɪniːz leɪˈɜːrʃiəs/ dy-OJ-in-eez lay-UR-shee-əs; Greek: Διογένης Λαέρτιος, Laertios; fl. 3rd century AD) 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 ancient Greek philosophy. His reputation is controversial among scholars because he often repeats information from his sources without critically evaluating it. He also frequently focuses on trivial or insignificant details of his subjects' lives while ignoring important details of their philosophical teachings and he sometimes fails to distinguish between earlier and later teachings of specific philosophical schools. However, unlike many other ancient secondary sources, D