The Sumerian King List records pre-Flood kings reigning tens of thousands of years each: proof, skeptics say, that Genesis borrowed and shrank its numbers from Babylonian myth, or, for ancient-astronaut readers, proof of a real lost antediluvian civilization with superhuman lifespans.

The Sumerian King List survives in several cuneiform recensions, first published by Stephen Langdon in 1923 and given its standard critical edition by Thorkild Jacobsen in 1939, and it opens with a run of kings who reigned before a great flood swept over the land. Their reign lengths are staggering: depending on which copy of the list you read, the eight kings before the flood total 241,200 years between them, with individual reigns running from 18,600 years up to 72,000. The Greek-writing Babylonian priest Berossos preserved a related tradition with ten antediluvian kings and comparably vast numbers. Genesis 5 also gives a ten-generation genealogy from Adam to Noah bridged by a flood, with lifespans that are long by any normal measure (Methuselah reaches 969 in Genesis 5:27) but nothing like tens of thousands of years. Once both texts were on the table together, scholars from Hermann Gunkel (1901) to the Assyriologist Heinrich Zimmern argued the resemblance was too close to be coincidence, and the reading that Genesis borrowed a shrunken version of the Babylonian numbers became a standard line in comparative Near Eastern scholarship for much of the twentieth century.

That reading has taken real hits since, and the fullest published rebuttal is Gerhard Hasel's 1978 study in Andrews University Seminary Studies, 'The Genealogies of Gen 5 and 11 and Their Alleged Babylonian Background,' which worked from the cuneiform texts directly rather than Berossos's later Greek summary. Hasel's case runs on several points. First, the supposed name correspondences between the lists, which looked promising when scholars only had Berossos to compare, collapsed once the actual Sumerian tablets turned up: the names are Sumerian, not Semitic, and even Zimmern conceded the parallels had 'come to a merciless end.' Second, the two texts aren't counting the same thing: Genesis gives years of life, the King List gives years of reign, which are different categories doing different narrative work. Third, Genesis 5 is a line-of-descent genealogy ('when X had lived N years, he fathered Y'), while the King List is a record of royal succession in named cities, tracking kingship as an institution rather than a lineage of fathers and sons; these are recognizably different ancient Near Eastern literary genres, a point also developed independently by R. R. Wilson's 1972 Yale dissertation on Old Testament genealogies and T. C. Hartman's 1972 Journal of Biblical Literature article. Fourth, and maybe most telling, the King List's own numbers don't agree with each other: total antediluvian years vary by more than 200,000 across different cuneiform copies of the same list, which Hasel and others take as a sign the huge reign-lengths were never meant to be read as sober arithmetic even by the Sumerians who wrote them, let alone as a shared 'true number' that Genesis then edited down.

None of that proves zero relationship. Both texts come out of the same broad ancient Near Eastern world, both use a flood to divide history into a before and after, and both attach extraordinary lifespans or reigns to the earliest age, so a shared cultural memory or convention of 'the ancients were greater' is a reasonable and fairly mainstream position (see also A. Malamat's 1968 Journal of the American Oriental Society piece on Old Babylonian king lists and biblical genealogies). What the evidence doesn't support is either of the two confident popular readings. Skeptics who cite the King List to say Genesis 5's numbers are diluted Babylonian myth are asserting a specific literary dependence that the actual textual comparison (different names, different units, different genre, unstable numbers even within Mesopotamian tradition) doesn't sustain. And ancient-astronaut readers who cite the same list as hard evidence for a real, technologically superior antediluvian civilization are making an even larger leap, treating numbers that don't even agree with each other inside the Sumerian corpus as if they were a precise historical record rather than the kind of idealized figure ancient king lists regularly used to signal the remoteness and grandeur of the deep past.