Shu-sin was king of Sumer

Sumer

Sumer was a civilization and historical region in southern Mesopotamia, modern Iraq during the Chalcolithic and Early Bronze Age....

 and Akkad

Akkad

The Akkadian Empire was an empire centered in the city of Akkad and its surrounding region in Mesopotamia....

, and was the penultimate king of the Ur III dynasty. He succeeded his brother Amar-Sin

Amar-Sin

Amar-Sin was the third ruler of the Ur III Dynasty. He succeeded his father Shulgi .Year-names are known for all 9 years of his reign...

, and reigned circa 1972-1964 BC. (short chronology)

Following an open revolt of his Amorite

Amorite

Amorite refers to an ancient Semitic people who occupied large parts of Mesopotamia from the 21st Century BC...

 subjects, he directed the construction of a fortified wall between the Euphrates

Euphrates

The Euphrates is the longest and one of the most historically important rivers of Western Asia. Together with the Tigris, it is one of the two defining rivers of Mesopotamia...

 and the Tigris

Tigris

The Tigris River is the eastern member of the two great rivers that define Mesopotamia, the other being the Euphrates. The river flows south from the mountains of southeastern Turkey through Iraq.-Geography:...

 rivers, intending it to hold off any further Amorite attacks. He was succeeded by his son Ibbi-Sin

Ibbi-Sin

Ibbi-Sin, son of Shu-Sin, was king of Sumer and Akkad and last king of the Ur III dynasty, and reigned circa 1963 BC-1940 BC . During his reign, the Sumerian empire was attacked repeatedly by Amorites...

.