OSRHOENE, or Orrhoene, the district of western Mesopotamia of which Edessa was the capital (see Mesopotamia, vol. xvi. p. 47). It may be here added that the older form of the name appears to be Chosroene (Chosdroene). Edessa or Orrhoi thus appears to have been “the city of Chosrau,” implying an early Parthian influence. See G. Hoffmann in Z. D. Μ. G., xxxii. 743.