Middle Ground: Rise of the Frontier"? What developments later take place in the "fromtier" region? Comments (0)   Terms, words, people and places Bardaisan , Edessa , Ctesiphon , Sasanian , Syriac, polyandry , Samarkand , Nestorian , Caspian, Manichaeans , Caucasus , steppeland , Attila (434-453), The Huns, Avars, Ukraine,