(Ὀρέστης), a Christian physician of Tyana in Cappadocia, called also Arestes, who suffered martyrdom during the persecution under Diocletian, A. D. 303, 304. An interesting account of his tortures and death is given by Simeon Metaphrastes, ap. Surium, De Probat. Sanctor. Histor., vol. vi. p. 231, where he is named Arestes. See also Menolog. Graec. vol. i. p. 178, ed. Urbin. 1727. He has been canonized by the Greek and Roman churches, and his memory is celebrated on Nov. 9. (See Bzovius, Nomenclator Sanctor. Profess. Mledicor.)