ملخص الدراسة:

After the fall of the Assyrian State in the year of 612 B.C., the Arab tribes started wandering in the western and north western areas of Iraq and in the eastern and south eastern areas of Syria.After the fall of Babylon in the year of 538 B.C. by the Akhmaned, this area came to be Known as "Arabia", i.e. the country of Arab. Hattra may be an Assyrian settlement. In the second century A.C., it became a religious and civil center for the wandering Arab tribes in this area.It is worth mentioning that the location of such city between Iraq and Syria was important for the commerce to develop and commercial Asian goods to be transported from Iraq to Syria. The European goods were also transported though Syria to Iraq and the other Asian countries. These commercial activities developed this city to an Arab kingdom the Romans tried destroy this city but gailed. Meanwhile, Hattra mand use of the conflict between Saluges (i.e. the governors of Iraq, Iran and Syria) and Romans and later on between the Parthean and Roman. The development of Hattra is due to the peaceful policy of the parthean in that era. After the rise of the Sasynain State in the year of 224 A.C., Ardasher tried to occupy it, but he failed. At the time of his son, Sapor Ist, the latter was able to occupy this city in the year of 244 A.C.