Ptolemy Caesar returns to Rome and is betrothed to Octavian’s 12 year old niece, Claudia Marcella. The Curia Senatus is complete and the Senate moves into the large, domed Senate room, the Conloquium. Octavian, Cleopatra, and Caesarion move into the finished northern section of the Palatium. Antony and Agrippa campaign west again after Ctesiphon is captured by the Parthian satrap, Golgius, who declares Mesopotamia his own personal kingdom, independent of Parthia and Rome.
Caesar defeats and kills Phraates V in the Third Battle of Persepolis and Musa retreats with the remaining Parthian army north toward Hecatompylos. The battle is a Pyrrhic victory for Caesar as he looses many of his veteran legionnaires to Phraates superior tactics. Caesar remains in Persepolis the remainder of the year, rebuilding his army. Scipio captures Hecatompylos after a 10 month siege. Phraates V’s son and new Parthian king, Orodes III, burns much of the city before he retreats and establishes Merv in northeast Parthia as his new capital. In September, Scipio engages and defeats Musa at the Battle of the Caspian Gates, securing northern and central Persia for Rome.