282 with a peace with Probus.
283 After murder of Probus, Carus invades Persia, takes Ctesiphon and Coche, and dies suddenly. There are civil wars, probably led by a brother of the king, assisted by the barbarous tribes in the northwest.
294 Death of Bahram. The throne seems to be contested by Bahram or Varanes III, probably a son of Hormuz, who reigns a short time, and Narses or Narseh, who soon gains the upper hand.
297 Narseh occupies Armenia and defeats the Roman general Galerius.
298 Peace with Rome after a great defeat of Narseh by Galerius. Armenia and Mesopotamia ceded to Rome. Peace lasts forty years.
303 Abdication of Narseh in favour of his son Hormuz II.
310 Death of Hormuz. His son Adharnarseh succeeds, but is soon deposed for cruelty. His brothers are killed or imprisoned and the new born (or unborn) son of Hormuz, Shapur or Sapor (II) Postumus is chosen king. He proves to be the greatest of the Sassanians.
337 Sapor begins a long war with Rome, owing to the latter becoming Christianised.
339-340 Terrible persecution of the Christians in Persia. The war with Rome continues. Sapor aims to seize Nisibis and reduce Armenia.
348 Great defeat of the emperor Constantius at the battle of Singara.