Rise of the Akkadian Empire
Also called: Akkad
Sargon of Akkad conquered the Sumerian city-states and founded the first empire to unite Mesopotamia.

Eric de Redelijkheid · CC BY-SA 2.0 · Source
Around 2334 BC the Akkadians, a Semitic people living north of Sumer, overthrew the Sumerian city-states one by one under Sargon. Campaigning from the Persian Gulf almost to the Mediterranean, he created the first unified empire in Mesopotamia, and his grandson Naram-Sin called himself “king of the four quarters”. Written in cuneiform, Akkadian long remained the diplomatic language of the Near East.
The empire fell around 2150 BC amid invasions by the Gutians from the mountains, after which the Third Dynasty of Ur revived Sumer. Its dates differ by decades from one chronology to another. The founding of Gojoseon recorded in the Samguk yusa (2333 BC) falls in this same period.