When people speaking Semitic languages first entered the Edin or plain of Babylonia is uncertain, but it must have been at a remote period. The cuneiform system of writing was still in process of growth when it was borrowed and adapted by the new comers, and the Semitic Babylonian language was profoundly influenced by the older language of the country, borrowing its words and even its grammatical usages.

Sumerian in its turn borrowed from Semitic Babylonian, and traces of Semitic influence in some of the earliest Sumerian texts indicate that Semitic speaking peoples were already on the Babylonian border. His native home was probably Arabia; hence Eridu ("the good city") and Ur ("the city") would have been built in Semitic territory, and their population may have included Semitic elements from the first. It was in the north, however, that the Semites first appear on the monuments. Here in Akkad the first Semitic empire was founded, Semitic conquerors or settlers spread from Sippara to Susa, Khana to the east of the Tigris was occupied by "West Semitic" tribes, and "out of" Babylonia "went forth the Assyrian." As in Assyria, so too in the states of Babylonia the patesi or high-priest of the god preceded the king. The state had grown up around a sanctuary, the god of which was nominally its ruler, the human patesi being his viceregent. In course of time many of the high-priests assumed the functions and title of king; while retaining their priestly office they claimed at the same time to be supreme in the state in all secular concerns. The god remained nominally at its head; but even this position was lost to him when Babylonia was unified under Semitic princes, and the earthly king became an incarnate god. A recollection of his former power survived, however, at Babylon,where Bel-Merodach adopted the king before his right to rule was allowed.

See also: Babylonia and Assyria