Which traditional enemy of the Roman Empire did Diocletian successfully campaign against?
Goths
Huns
Sassanid Persia
Vandals
Answer
Diocletian, aided by Galerius, campaigned successfully against Sassanid Persia, the empire's traditional enemy. In 299, they sacked the Persian capital, Ctesiphon, and achieved a lasting and favorable peace.
Mastering the Mighty Diocletian: A Roman Emperor's Reign Revealed