The tall pedestal west of the Propylaia, which originally supported a bronze lifi-size quadriga, belongs to the monument dedicated by the Athenians to Marcus vipsanius Agrippa, son-in-law and general of the Roman Emperor Octavian Augustus. Agrippa was a benefactor of the city, as indicated by the incised honorary inscription on the western face of the pedestal.
Today only the pedestal, made of gray Hymmetian marble and Pentelic marble at the base and crown, is preserved, measuring a total heihgt of 8.9 m. The quadriga, which would have been mounted by Agrippa, is not preserved. The dedication was made between 27 B.C., when Agrippa became consul for the third time, and 12 B.C., the year of his death.
However, the monument was not originally intended for the Roman general. The architectural features of the pedestal, the technical details on its upper surface, as well as traces of an earlier defaced inscription indicate that the monument was erected in the first half of the second century B.C. and originally bore the chariot of one of the Pergamene Kings, probably Eumenes II or Attalus II. The deme dedicated the monument in order to commemorate a victory of the Pergamene Kings in a chariot race in the Panathenaic Games. The Pergamene Kings benefacted the city by funding the erection of two important public buildings, the Stoa of Eumenes to the south of the Acropolis and the Stoa of Attalus in the Athenian Agora.