The Assyrians There are different periods of the Assyrian empire. The first was called the Old Assyrian period which lasted from 2000-1550 BC. Then there was the Middle Assyrian period which lasted from 1550-1200 BC. The last was the Neo-Assyrian period which lasted from 1200-600 BC. The final phase of the Neo-Assyrian period is called the Assyrian Empire. The Old and Middle Assyrian periods ( 2000 - 1200 BC ) The name Ashur was used by the Assyrians to designate not only their country, but also their most ancient city and their national god. The cities of Ashur (near modern al-Sharqat), Nineveh, and Irbil formed a triangle that defined the origina