In belles lettres, Sumerian still predominates, although there is no lack of Akkadian masterpieces, including the oldest Akkadian version of the epic of Gilgamesh. The very high prestige still enjoyed by Sumerian should not be underestimated, and it continued to be used for inscriptions on buildings and the yearly dating formulas. Aside from being the language of practical affairs (i.e., letters and contracts), there was a high incidence of Akkadian in soothsaying and divinatory literature. To be sure, the Sumerians also practiced foretelling the future from the examination of animal entrails, but as far as is known they did not write down the results. In Akkadian, on the other hand, there are extensive and “scientifically” arranged compendiums of omens based on the liver (as well as other omens), reflecting the importance that the divination of the future had in religion, in politics, and in all aspects of daily life.
Judging by its increasingly refined juridical thought, its ability to master in writing ever more complicated administrative procedures, its advanced knowledge of mathematics, and the fact that it marks the beginning of the study of astronomy, the Old Babylonian period appears to have been a time of exceedingly active intellectual endeavour—despite, if not because of, its lack of political cohesiveness. The Hurrians
The Hurrians enter the orbit of ancient Middle Eastern civilization toward the end of the 3rd millennium bce. They arrived in Mesopotamia from the north or the east, but it is not known how long they had lived in the peripheral regions. There is a brief inscription in Hurrian language from the end of the period of Akkad, while that of King Arishen (or Atalshen) of Urkish and Nawar is written in Akkadian. The language of the Hurrians must have belonged to a widespread group of ancient Middle Eastern languages. The relationship between Hurrian and Subarean has already been mentioned, and the language of the Urartians, who played an important role from the end of the 2nd millennium to the 8th century bce, is likewise closely related to Hurrian. According to the Soviet scholars Igor M. Diakonov and Sergei A. Starostin, the Eastern Caucasian languages are an offshoot of the Hurrian-Urartian group.
It is not known whether the migrations of the Hurrians ever took the form of aggressive invasion; 18th-century-bce texts from Mari speak of battles with the Hurrian tribe of Turukku south of Lake Urmia (some 150 miles from the Caspian Sea’s southwest corner), but these were mountain campaigns, not the warding off of an offensive. Proper names in cuneiform texts, their frequency increasing in the period of Ur III, constitute the chief evidence for the presence of Hurrians. Nevertheless, there is no clear indication that the Hurrians had already advanced west of the Tigris at that time. An entirely different picture results from the 18th-century palace archives of Mari and from texts originating near the upper Khābūr River. Northern Mesopotamia, west of the Tigris, and Syria appear settled by a population that is mainly Amorite and Hurrian; and the latter had already reached the Mediterranean littoral, as shown by texts from Alalakh on the Orontes. In Mari, literary texts in Hurrian also have been found, indicating that Hurrian had by then become a fully developed written language as well.
The high point of the Hurrian period was not reached until about the middle of the 2nd millennium. In the 15th century, Alalakh was heavily Hurrianized; and in the empire of Mitanni the Hurrians represented the leading and perhaps the most numerous population group. Dietz O. Edzard Mesopotamia to the end of the Achaemenian period The Kassites, the Mitanni, and the rise of Assyria
About 150 years after the death of Hammurabi, his dynasty was destroyed by an invasion of new peoples. Because there are very few written records from this era, the time from about 1560 bce to about 1440 bce (in some areas until 1400 bce) is called the dark ages. The remaining Semitic states, such as the state of Ashur, became minor states within the sphere of influence of the new states of the Kassites and the Hurrians/Mitanni. The languages of the older cultures, Akkadian and Sumerian, continued or were soon reestablished, however. The cuneiform script persisted as the only type of writing in the entire area. Cultural continuity was not broken off, either, particularly in Babylonia. A matter of importance was the emergence of new Semitic leading classes from the ranks of the priesthood and the scribes. These gained increasing power. The Kassites in Babylonia
The Kassites had settled by 1800 bce in what is now western Iran in the region of Hamadan-Kermanshah. The first to feel their forward thrust was Samsuiluna, who had to repel groups of Kassite invaders. Increasing numbers of Kassites gradually reached Babylonia and other parts of Mesopotamia. There they founded principalities, of which little is known. No inscription or document in the Kassite language has been preserved. Some 300 Kassite words have been found in Babylonian documents. Nor is much known about the social structure of the Kassites or their culture. There seems to have been no hereditary kingdom. Their religion was polytheistic; the names of some 30 gods are known.
The beginning of Kassite rule in Babylonia cannot be dated exactly. A king called Agum II ruled over a state that stretched from western Iran to the middle part of the Euphrates valley; 24 years after the Hittites had carried off the statue of the Babylonian god Marduk, he regained possession of the statue, brought it back to Babylon, and renewed the cult, making the god Marduk the equal of the corresponding Kassite god, Shuqamuna. Meanwhile, native princes continued to reign in southern Babylonia. It may have been Ulamburiash who finally annexed this area around 1450 and began negotiations with Egypt in Syria. Karaindash built a temple with bas-relief tile ornaments in Uruk (Erech) around 1420. A new capital west of Baghdad, Dūr Kurigalzu, competing with Babylon, was founded and named after Kurigalzu I (c. 1400–c. 1375). His successors Kadashman-Enlil I (c. 1375–c. 1360) and Burnaburiash II (c. 1360–c. 1333) were in correspondence with the Egyptian rulers Amenhotep III and Akhenaton (Amenhotep IV). They were interested in trading their lapis lazuli and other items for gold as well as in planning political marriages. Kurigalzu II (c. 1332–c. 1308) fought against the Assyrians but was defeated by them. His successors sought to ally themselves with the Hittites in order to stop the expansion of the Assyrians. During the reign of Kashtiliash IV (c. 1232–c. 1225), Babylonia waged war on two fronts at the same time—against Elam and Assyria—ending in the catastrophic invasion and destruction of Babylon by Tukulti-Ninurta I. Not until the time of the kings Adad-shum-uṣur (c. 1216–c. 1187) and Melishipak (c. 1186–c. 1172) was Babylon able to experience a period of prosperity and peace. Their successors were again forced to fight, facing the conqueror King Shutruk-Nahhunte of Elam (c. 1185–c. 1155). Cruel and fierce, the Elamites finally destroyed the dynasty of the Kassites during these wars (about 1155). Some poetical works lament this catastrophe.