How did the Assyrian Empire develop?

Assyria was the region in the Near East which, under the Neo-Assyrian Empire, reached from Mesopotamia (modern-day Iraq) through Asia Minor (modern Turkey) and down through Egypt. The empire began modestly at the city of Ashur (known as Subartu to the Sumerians), located in Mesopotamia north-east of Babylon, where merchants who traded in Anatolia became increasingly wealthy, and that affluence allowed for the growth and prosperity of the city. According to one interpretation of passages in the biblical Book of Genesis, Ashur was founded by a man named Ashur son of Shem, son of Noah, after the Great Flood, who then went on to found the other important Assyrian cities