The Akkadian Empire () was the first ancient empire of Mesopotamia after the long-lived civilization of Sumer. It was centered in the city of Akkad () and its surrounding region. The empire united Akkadian and Sumerian speakers under one rule. The Akkadian Empire exercised influence across Mesopotamia, the Levant, and Anatolia, sending military expeditions as far south as Dilmun and Magan (modern Saudi Arabia, Bahrain, and Oman) in the Arabian Peninsula. The Akkadian Empire reached its political peak between the 24th and 22nd centuries BC, following the conquests by its founder Sargon of Akkad. Under Sargon and his successors, the Akkadian language was briefly imposed on neighboring conquered states such as Elam and Gutium. Akkad is sometimes regarded as the first empire in history, though the meaning of this term is not precise, and there are earlier Sumerian claimants. History of research The Bible refers to Akkad in Genesis 10:10–12, which states: "The beginning of his [Nimrod's] kingdom was Babel, and Erech, and Accad, and Calneh, in the land of Shinar. Out of that land he went forth into Assyria, and built Nineveh, and Rehoboth-Ir, and Calah, and Resen between Nineveh and Calah (the same is the great city)." Nimrod's historical identity is unknown or debated, but Nimrod has been identified as Sargon of Akkad by some, and others have compared him with the legendary Gilgamesh, king of Uruk. Today, scholars have documented some 7,000 texts from the Akkadian period, written in both Sumerian and Akkadian. Many later texts from the successor states of Assyria and Babylonia also deal with the Akkadian Empire. Understanding of the Akkadian Empire continues to be hampered by the fact that its capital Akkad has not yet been located, despite numerous attempts. Precise dating of archaeological sites is hindered by the fact that there are no clear distinctions between artifact assemblages thought to stem from the preceding Early Dynastic period, and those thought to be Akkadian. Likewise, material that is thought to be Akkadian continues to be in use into the Ur III period. Many of the more recent insights on the Akkadian Empire have come from excavations in the Upper Khabur area in modern northeastern Syria which was to become a part of Assyria after the fall of Akkad. For example, excavations at Tell Mozan (ancient Urkesh) brought to light a sealing of Tar'am-Agade, a previously unknown daughter of Naram-Sin, who was possibly married