These colonies were extremely numerous. Seleucus Nicator founded thirty-nine cities, all named from himself, or some of his relations (Appian in Syriac. p. 124). The aera of Seleucus (still in use among the Eastern Christians) appears as late as the year 508, of Christ 196, on the medals of the Greek cities within the Parthian empire. Moyle, vol. i. p. 273, etc., and M. Freret, Mem. de l'Academie, tom. xix.