Semnan province was one of sixteen divided of Avesta in the ancient era whole of the duration for government of medes and achaemenians. This province accounted as one of the biggest state forpartions. This state had good development in sasanian era. Semnan after the periods of Islam was a part of historical regions of Ghomes or "Komesh'',and this province was witness the war s , defeats and victories in the past.the ''silk road" pass in the middle of this province.