In the third millennium BCE, the concept of kings developed, most likely due to growing disputes over resources. The power of religious leaders declined as the power of kings increased. Although the kings took control of the temples, the Mesopotamian kings did not claim divine power. Political changes occurred in Mesopotania due to the succession of peoples who followed the initial Sumerian people, such as the Akkadians, Kassites, Medes, and Persians, who established their temporary political dominance. In 1750 BC, King Hammurabi's written law code was used to maintain authority and political continuity. In stark contrast is the continuity of political history in ancient Egypt. The legendary King Menes united Upper and Lower Egypt into a single nation that lasted with cultural continuity from 3,100 to 1070 BC with thirty dynasties. Unlike the Mesopotamian kings, the Egyptian king was represented as Horus and as the son of Ra, and fit the pattern of the dead coming back to life and the climatic renewal of the sun-god's life. As Egypt's chief priest, he intervened with the gods on behalf of his people and his land. No written code of law has been developed in Egypt. Pharaoh ruled the country through great power