The area was reunited by Hammurabi, a king of Babylon of Amorite descent. From his reign on, the alluvial plain of southern Iraq was called, with a deliberate archaism, Mât Akkadî, "the country of Akkad", after the city that had united the region centuries before, but it is known to us as Babylonia. It was one of the most fertile and rich parts of the ancient world.