Surena defeated a superior Roman force under a leader who was the wealthiest man in Roman history bar which other leader?
Surena:  Under his command Parthians decisively defeated a numerically superior Roman invasion force under the command of Marcus Licinius Crassus. Marcus Licinius Crassus:  Amassing an enormous fortune during his life, Crassus is, excepting Augustus Caesar, considered the wealthiest man in Roman history.
Augustus Caesar