Orestes (Ο᾿ρέστης), a Christian physician of Tyana, in Cappadocia, called also Arestes, 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. Suriam, De Probat. Sancto: Histor. 6, 231), where he is named Aresters. See also Menolog. Graec. 1:178 (ed. Urbin. 1727). Orestes has been canonized by the Greek and Roman churches, and his memory is celebrated on Nov. 9. See Bzovius, Nomenclator Sanctor. Profess. Medicor.