 Under the Achaemenids, Aramaic continued to prosper, but Assyrian continued its decline.The language's final demise came about during the Hellenistic period when it was further marginalized by Koine Greek, even though Neo-Assyrian cuneiform remained in use in literary tradition well into Parthian times.The latest known text in cuneiform Babylonian is an astronomical almanac dated to 79/80 AD.