ORESTIS (Ὀρεστίς, Ptol. 3.13. § § 5, 22; Steph. B. s. v.;Liv. 27.33, 31.40) or ORESTIAS(Ὀρεστίας, Strab. 7. p. 326), was the name given to the district which they occupied, which, though it is not named by Livy and Diodorus among the countries which entered into the composition of the Fourth Macedonia, was probably included in it, because the greater part, at least, of Orestis was situated to the E. of Pindus. This subdivision of Upper Macedonia is represented by the modern districts of Grámista, Anaselítza, and Kastoría. (Leake, Northern Greece, vol. 3. p. 305, vol. iv. pp. 121—124.)
[E.B.J]