Babylon was a major city of ancient Mesopotamia in the fertile plain between the Tigris and Euphrates rivers. The city was built upon the Euphrates and divided in equal parts along its left and right banks, with steep embankments to contain the river's seasonal floods. Babylon was originally a small Semitic Akkadian city dating from the period of the Akkadian Empire c. 2300 BC. The town attained independence as part of a small city-state with the rise of the First Amorite Babylonian Dynasty in 1894 BC. Claiming to be the successor of the more ancient Sumero-Akkadian city of Eridu, Babylon eclipsed Nippur as the "holy city" of Mesopotamia around the time Amorite king Hammurabi created the first short lived Babylonian Empire in the 18th century BC. Babylon grew and South Mesopotamia came to be known as Babylonia.