 Antony was assigned Rome's eastern provinces, including the client kingdom of Egypt, then ruled by Cleopatra VII Philopator, and was given the command in Rome's war against Parthia.Relations among the triumvirs were strained as the various members sought greater political power.Civil war between Antony and Octavian was averted in 40 BC, when Antony married Octavian's sister, Octavia.