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The Sumerian King List or Chronicle of the One Monarchy is an ancient literary composition written in Sumerian that was likely created and redacted to legitimize the claims to power of various city-states and kingdoms in southern Mesopotamia during the late third and early second millennium BC. It does so by repetitively listing Sumerian cities, the kings that ruled there, and the lengths of their reigns. Especially in the early part of the list, these reigns often span thousands of years. In the oldest known version, dated to the Ur III period but probably based on Akkadian source material, the SKL reflected a more linear transition of power from Kish, the first city to receive kingship, to Akkad. In later versions from the Old Babylonian period, the list consisted of a large number of cities between which kingship was transferred, reflecting a more cyclical view of how kingship came to a city, only to be inevitably replaced by the next. In its best-known and best-preserved version, as recorded on the Weld-Blundell Prism, the SKL begins with a number of antediluvian kings, who ruled before a flood swept over the land, after which kingship went to Kish. It ends with a dynasty from Isin, which is well-known from other contemporary sources. The SKL is preserved in several versions, the first fragement of which was published in 1906 by Hermann Volrath Hilprecht, and the second in 1911 by Jean-Vincent Scheil. Most of these date to the Old Babylonian period, but the oldest version of the SKL dates back to the Ur III period. The clay tablets on which the SKL was recorded were generally found on sites in southern Mesopotamia. These versions differ in their exact content; some sections are missing, others are arranged in a different order, names of kings may be absent or the lengths of their reigns may vary. These differences are both the result of copying errors, and of deliberate editorial decisions to change the text to fit current needs. In the past, the Sumerian King List was considered as an invaluable source for the reconstruction of the political history of Early Dynastic Mesopotamia. More recent research has indicated that the use of the SKL is fraught with difficulties, and that it should only be used with caution, if at all, in the study of ancient Mesopotamia during the third and early second millennium BC.