 Following the Muslim conquest of Persia by the Arabs in the seventh-century, the Aramaic-derived writing system was replaced by the Arabic script in all but Zoroastrian usage, which continued to use the name "pahlavi" for the Aramaic-derived writing system and went on to create the bulk of all Middle Iranian literature in that writing system.The dialects mentioned in the last section were all descended from Achaemenid Imperial Aramaic.However, the diverse regional dialects of Late Ancient Aramaic continued alongside them, often as simple, spoken languages.