Assyria was the dominant power in Marduk 's region between the 20th and 18th centuries BC .
The only serious rival to Marduk after c. 1750 BC was the god Aššur ( Ashur ) ( who had been the supreme deity in the northern Mesopotamian state of Assyria since the 25th century BC ) which was the dominant power in the region between the 20th and 18th centuries BC , and between the 14th to the late 7th century BC .
Marduk