that is, Golden Mouth, a celebrated orator and philosopher of Greece, in the first century, was born at Prusa in Bithynia. He attempted to persuade Vespasian to quit the empire; was hated by Domitian; but acquired the esteem of Trajan. This last prince took pleasure in conversing with him, and made him ride with him in his triumphal chariot. There are still extant 80 of Dio's orations, and some other of his works; the best edition of which is that of Hermann Samuel Raimarus, in 1759, in folio.