BC (although it must already have been a growing urban center during the fourth millennium). As other Sumerians, the new settlers of Ur were a non-Semitic people who may have come from the east circa 3300 BC, and spoke a language isolate. The third millennium BC is generally described as the Early Bronze Age of Mesopotamia, which ends approximately after the demise of the Third Dynasty of Ur in the 21st century BC. Bronze Age There are various main sources informing scholars about the importance of Ur during the Early Bronze Age. The First Dynasty of Ur seems to have had great wealth and power, as shown by the lavish remains of the Royal Cemetery at Ur. The Sumerian King List provides a tentative political history of ancient Sumer and mentions, among others, several rulers of Ur. Mesannepada is the first king mentioned in the Sumerian King List, and appears to have lived in the 26th century BC. That Ur was an important urban centre already then seems to be indicated by a type of cylinder seal called the City Seals. These seals contain a set of Proto-Cuneiform signs which appear to be writings or symbols of the name of city-states in ancient Mesopotamia. Many of these seals have been found in Ur, and the name of Ur is prominent on them. Ur came under the control of the Semitic-speaking Akkadian Empire founded by Sargon the Great between the 24th and 22nd centuries BC. This was a period when the Semitic-speaking Akkadians, who had entered Mesopotamia in approximately 3000 BC, gained ascendancy over the Sumerians, and indeed much of the ancient Near East. Ur III After a short period of chaos following the fall of the Akkadian Empire the third Ur dynasty was established when the king Ur-Nammu came to power, ruling between c. 2047 BC and 2030 BC. During his rule, temples, including the Ziggurat of Ur, were built, and agriculture was improved through irrigation. His code of laws, the Code of Ur-Nammu (a fragment was identified in Istanbul in 1952) is one of the oldest such documents known, preceding the Code of Hammurabi by 300 years. He and his successor Shulgi were both deified during their reigns, and after his death he continued as a hero-figure: one of the surviving works of Sumerian literature describes the death of Ur-Nammu and his journey to the underworld. Ur-Nammu was succeeded