Phraates IV secured the Parthian throne through dynastic violence and ruled during renewed confrontation with Rome. His forces and allies resisted Mark Antony’s invasion in 36 BCE, exploiting Roman supply difficulties and destroying the siege train before Antony’s costly retreat from Media Atropatene.
The failed campaign damages Antony’s prestige and contributes to the political vulnerability later used by Octavian. Phraates IV was king of the Parthian Empire during Mark Antony’s failed invasion of 36 BCE.
In Alex Gough’s Caesar’s Nemesis, Mark Antony’s invasion of Parthian territory fails after the loss of his siege train and a devastating retreat, weakening his authority and deepening his dependence on Cleopatra’s resources. In Peter Darman’s Lord of War, set in the Parthian Empire in the later first century BCE, under Phraates IV and an uneasy accommodation with Rome, you want peace and a happy retirement, Pacorus?.