A town in Northern Cappadocia, on the right bank of the Halys, on or near a hill whence it was named, on the road between Ancyra and Archelais.  The letter appears to Maran (Vita S. Bas. xvi.) to have been written before the encouragement given to the Arians by the visit of Valens in 372.  The result of Basil’s appeal to the Parnassenes was the election of an orthodox bishop, expelled by the Arians in 375, and named Hypsis or Hypsinus.  cf. Letter ccxxxvii., where Ecdicius is said to have succeeded Hypsis; and ccxxxviii., where Ecdicius is called Παρνασσηνός.