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240 CE 250 CE 260 CE 270 CE 280 CE 290 CE 300 CE 310 CE 320 CE 330 CE
245 CE: Birth of Emperor Diocletian.
284 CE - 305 CE: Reign of Roman Emperor Diocletian.
284 CE - 275 CE: Crisis of the Third Century resolved during the reign of Diocletian.
284 CE - 305 CE: Reign of Diocletian who resolves the Crisis of the Third Century and eventually divides the Roman Empire for easier management.
285 CE: The Roman empire is split into the Western and Eastern Roman empires.
289 CE: Emperor Diocletian defeats Sarmatians.
292 CE: Emperor Diocletian defeats Saracens.
293 CE: Diocletian reforms the Roman coinage system, guaranteeing the gold aurei at 60 to a pound and minting the nummus coin.
298 CE: Roman Emperor Diocletian reunifies the Kingdom of Armenia.
301 CE: Diocletian reasseses the values of Roman coins and limits minting rights to between 12 and 15 mints across the empire.
303 CE: Emperor Diocletian orders all Churches destroyed.
305 CE: The Baths of Diocletian in Rome are completed.
311 CE: Death of Emperor Diocletian.
330 CE: Diocletian and Maximian celebrate a triumph in Rome for their victories in Britain and Africa.