Bactria

(Βακτρία) or Bactriāna (Βακτριανή). A province of the Persian Empire, bounded on the south by Mount Paropamisus, which separated it from Ariana; on the east by the northern branch of the same range, which divided it from the Sacae; on the northeast by the Oxus, which separated it from Sogdiana; and on the west by Margiana. It was included in the conquests of Alexander, and formed a part of the kingdom of the Seleucidae until B.C. 255, when Theodotus, its governor, revolted from Autiochus II., and founded the Greek kingdom of Bactria, which lasted till B.C. 134 or 125, when it was overthrown by the Parthians.