Which of the following was the first known king of Mesopotamia?
A. Sargon
B. Lipit-Ishtar
C. Hammurabi
D. Gilgamesh
Since the existence of Gilgamesh hasn't been established, the first king was probably Sargon.
http://www.allabouthistory.org/ancient-mesopotamia.htm
The first known king of Mesopotamia was A. Sargon. To determine the correct answer, we can analyze the options provided and look for historical information.
Option B, Lipit-Ishtar, was a king of the city-state of Isin around 1934-1924 BC, so he ruled much later than the first known king.
Option C, Hammurabi, was the sixth king of the Babylonian Dynasty and ruled from 1792 to 1750 BC. While known for codifying the famous Code of Hammurabi, he was not the first known king of Mesopotamia.
Option D, Gilgamesh, is a legendary figure from ancient Mesopotamian mythology and literature. However, he was not a historical king and ruled in Uruk, one of the city-states of Mesopotamia, rather than ruling over the entire region as a king of Mesopotamia.
Therefore, the correct answer is A. Sargon. Sargon of Akkad was a historical king who established the Akkadian Empire around 2334-2279 BC. He conquered many city-states in Mesopotamia and is considered the first ruler to unite much of Mesopotamia under one empire.