Another source purporting to describe Ptolemaic Jerusalem is the Letter of Aristeas, an account of the translation into Greek of the Septuagint. The author, supposedly an Alexandrian Jew in the service of Ptolemy II Philadelphus (309–246 BCE), describes a visit to the city, including the Temple Mount and the adjacent citadel, the Ptolemaic Baris. The Letter of Aristeas, however, is apparently a later creation of the mid 2nd century BCE.[26] It most likely dates to the Seleucid or Hasmonean periods, nor is there any certainty that it is a genuine eyewitness account.