The conquest by Alexander the Great did not destroy the unity of Aramaic language and literature immediately. Aramaic that bears a relatively close resemblance to that of the 5th century BC can be found right up to the early 2nd century BC. The Seleucids imposed Greek in the administration of Syria and Mesopotamia from the start of their rule. In the 3rd century BC, Greek overtook Aramaic as the common language in Egypt and Syria. However, a post-Achaemenid Aramaic continued to flourish from Judaea, Assyria, Mesopotamia, through the Syrian Desert and into northern Arabia.