The king of Assyria (Akkadian: Iššiʾak Aššur, later šar māt Aššur) was the ruler of the ancient Mesopotamian kingdom of Assyria, which was founded in the late 21st century BC and fell in the late 7th century BC. For much of its early history, Assyria was little more than a city-state, centered on the city Assur, but from the 14th century BC onwards, Assyria rose under a series of warrior kings to become one of the major political powers of the Ancient Near East, and in its last few centuries it dominated the region as the largest empire the world had seen thus far. Ancient Assyrian history is typically divided into the Old, Middle and Neo-Assyrian periods, all marked by ages of ascendancy and decline.
The ancient Assyrians did not believe that their king was divine himself, but saw their ruler as the vicar of their principal deity, Ashur, and as his chief representative on Earth. In their worldview, Assyria represented a place of order while lands not governed by the Assyrian king (and by extension, the god Ashur) were seen as places of chaos and disorder. As such it was seen as the king's duty to expand the borders of Assyria and bring order and civilization to lands perceived as uncivilized. As Assyria expanded, its rulers gradually adopted grander and more boastful titles. Early kings used Iššiʾak Aššur (representative/viceroy of Ashur), considering the god Ashur to be the true king. From the time of Ashur-uballit I (14th century BC), the rulers instead used king (šar). In time, further titles, such as "king of Sumer and Akkad", "king of the Universe" and "king of the Four Corners of the World", were added, often to assert their control over all of Mesopotamia.
