The siege of Nisibis in 197 was a siege carried out by Vologases V's Parthian army against the garrisoned city commanded by Septimius Severus' lieutenant, Julius Laetus. The city was initially captured by Severus's army in 195. The city was besieged by Vologases V and was doomed to fall, if not for the defense by Laetus. Septimius Severus then marches with his men into the city, and quickly liberates it, the Parthians retreating at the sight of the Roman army.