a Greek rhetorician, who is mentioned in the work ad Herennium (1.11), where he is called doctor noster, and an opinion of his is quoted. The MSS. of that passage, however, vary, some having Hermes, and others Hermestes. Some critics have conjectured Hermagoras, but the opinion quoted in the work ad Herennium does not agree with what we know to have been the opinion of Hermagoras.
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890