or DIOPHANTES (Διόφαντος or Διοφάνντης), a medical writer of Lycia (Galen, De Comnpos. Medicam. sec. Locos, 9.4, vol. xiii. p. 281), several of whose medical formulae are quoted by Galen (vol. xii. p. 845; 13.507, 805; 14.175, 181), and who must, therefore, have lived in or before the second century after Christ.