Dio Chrysostom, Dio of Prusa or Cocceianus Dio, was a Greek orator, writer, philosopher and historian of the Roman Empire in the 1st century AD. Eighty of his Discourses are extant, as well as a few letters, a mock essay Encomium on Hair, and a few other fragments. His sobriquet Chrysostom comes from the Greek chrysostomos, which literally means "golden-mouthed".