Conquest of Sumer by Sargon of Akkad
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The military campaign of Sargon of Akkad resulted in the conquest of most of the Sumerian polities. Sargon's state is sometimes identified as the first empire in recorded history.
Chronology
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January 2289 BC: A decade after Ebla's destruction (c. 2300 BC middle chronology), Mari was destroyed and burned by Sargon of Akkad during his conquests.
January 2333 BC: Sargon was a usurper who seized power in the city of Kish after a coup around 2334 BC and started the Akkadian Empire.
January 2333 BC: Sargon of Akkad defeated and captured Lugal-zage-si of Umma (who was King of Sumer) in the Battle of Uruk and conquered his empire.
January 2299 BC: Sargon of Akkad, defeated the Elamite King Luh-ishan and subjected Susa.
January 2299 BC: Erbil was conquered by the Akkadian Empire.
January 2278 BC: Sargon of Akkad subjugated the Northern Mesopotamian region after he destroyed Mari.
January 2299 BC: At about 2300 BC, Assur was conquered by Sargon of Akkad.
Selected Sources
Bauer, Susan Wise (2007). The History of the Ancient World: From the Earliest Accounts to the Fall of Rome. W. W. Norton & Company.
Edwards, I.E.S. / Gadd, C.J. / Hammond, N.G.L. (2008): The Cambridge Ancient History, 3rd ed., Vol. I, Part 2, Cambridge University Press, p. 104-144
Frederick C. Mish (Hrsg.): Akkad. In: Webster’s Ninth New Collegiate Dictionary. 9. Auflage. Merriam-Webster, Springfield 1985
Kopanias, K. / MacGinnis, J. (2013): The Archaeology of the Kurdistan Region of Iraq and Adjacent Regions, Archaeopress Publishing Ltd, p.1
Middleton, John (2015). World Monarchies and Dynasties. Routledge. p. 79