Джемдет-Наср
Mesopotamia's "proto-literate" period spans roughly the 35th to 32nd centuries BC. The first unequivocal written documents start with the Uruk IV period, from circa 3,300 BC, followed by tablets found in Uruk III, Jemdet Nasr and Susa (in Proto-Elamite) dating to the period until circa 2,900 BC.