In 1970, a farmer from Susa ploughing a field west of the river Shaour discovered the bases of several ancient Achaemenid columns. From the inscription, known as A2Sd, it became clear that they belonged to a palace built by king Artaxerxes II Mnemon (404-358):
By the grace of Ahuramazda, I built this palace, which I have built in my lifetime as a pleasant retreat [paradise]. May Ahuramazda, Anahita, and Mithra protect me and my building against evil.
The roof of the hall rested on sixty-four wooden columns, which were painted blue. The walls were covered with red and blue plaster. The site appears to have remained in use until the Early Islamic period.