Before revision: History Multi-level shadoof system in Egypt|alt=Multi-level shadoofs The most likely and widely accepted theory states that the shadoof was invented in prehistoric times in Mesopotamia as early as the time of Sargon of Akkad (around XXII and XXIII centuries BCE).
After revision: History Multi-level shadoof system in Egypt|alt=Multi-level shadoofs One theory states that the shadoof was invented in prehistoric times in Mesopotamia as early as the time of Sargon of Akkad (around 24th and 23rd centuries BCE).