Around 3000 BC the Sumerian culture flourished in Mesopotamia—the part of the Fertile Crescent between and around the Tigris and Euphrates rivers. Incursions from Semitic peoples of the Arabian Peninsula led to Akkadian supremacy after the victory of Sargon the Great (c. 2340 BC). The Sumerian cities, such as Ur, reasserted their independence until 1700 BC, when King Hammurabi established the first dynasty of Babylon. Hammurabi and his son, Samsu-iluna, presided over the political and cultural apogee of Babylon. Babylonia was challenged by the Anatolian Hittites, who sacked Babylon in 1595 BC. A weakened Babylonia fell to the Kassites from the Zagros mountains, who held sway for over 400 years. The power-vacuum in northern Babylonia was filled by the Hurrian kingdom of Mitanni until Assyria’s dominance in the 13th century BC. The Semitic Assyrians built an empire that stretched from Tarsus on the Mediterranean to Babylon, which they sacked in 1240 BC.