The classical name of a country on the SE. shores of the Black Sea, stretching from the river Halys to the borders of Armenia; is represented by the modern Turkish provinces of Trebizond and Sivas. Originally a Persian province, it became independent shortly after 400 B.C., and remained so till part was annexed to Bithynia in 65 B.C., and the rest constituted a Roman province in A.D. 63.