The Proto-Elamite period's the time of ca. 3200 BC to 2700 BC when Susa, the later capital of the Elamites began to receive influence from the cultures of the Iranian plateau. In archaeological terms this corresponds to the late Banesh period. This civilization's recognized as the oldest in Iran and was largely contemporary with its neighbour, Sumerian civilization, the oldest in the world, which began around 5200 BC. The Proto-Elamite script's an Early Bronze Age writing system briefly in use… (More on Proto-elamite)