The Weld-Blundell Prism is a clay, cuneiform inscribed vertical prism housed in the Ashmolean Museum. The prism was found in a 1922 expedition in modern day Iraq by British archaeologist Herbert Weld Blundell. The four sides, about 20 cm high and 9 cm wide, are inscribed in the Sumerian language with lists of Sumerian kings; each side contains the text in two columns: this is the famous Sumerian King List.
The list begins with the antediluvian rulers and ends with Sin-magir of the Isin dynasty (r. 1827–1817). The list was most likely written in Sin-magir's final year, or soon after. Many, especially antediluvian, kings are credited with incredibly long reigns (counted in sars and nerah), as a result of which many scholars consider this work to be more artistic than historical.
Various theories are being constructed in an attempt to explain such large numbers. They are supposed to express the great importance of rulers who were considered semi- gods . According to another version, sar (3600 years) and ner (600 years), the units of time measurement in the Sumerian number system, should be taken as years and months, respectively.
The museum number is AN1923.444.