Akkad
The fall of the empire established by Sargon seems to have been as sudden as its rise, and little is known about the Gutian period. From the fall of Akkad ca. 2083 BC until the Sumerian renaissance ca. 2050 BC, there is much that is still dark. It has recently been suggested that the regional decline at the end of the Akkadian period (and also in the Ancient Egyptian Old Kingdom) was associated with rapidly increasing aridity, and failing rainfall in the region of the Ancient Near East.