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" "There is a written and an unwritten law. The one by which we regulate our constitutions in our cities is the written law; that which arises from customs is the unwritten law.
Diogenes Laërtius (fl. c. 3rd century AD), was a biographer of ancient Greek philosophers. His Lives and Opinions of Eminent Philosophers, in ten books, is still extant and is an important source of information on the development of Greek philosophy. The period when he lived is not exactly known, but it is supposed to have been during the reigns of Septimius Severus and Caracalla.
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