The monument of Philopappos is dated to 114-116 A.D. It was erected by the Athenians in honor of the great benefactor of their city, the exiled prince of Commagene, Julius Antiochus Philopappos who settled in Athens, became a citizen and assumed civic and religious offices. According to Pausanias, the monument was built on the same site where Mousaios was formerly buried.