284 Diocletian becomes Emperor.
300 Franks cross the Rhine into Gaul
306 Constantine the Great becomes Emperor.
313 Constantine becomes first Christian Emperor.
330 Constantinople becomes the new center of the Roman Empire.
354 Northern Frontier of Roman Empire collapses.
375 Goths cross the Danube under protection of Emperor Valens.
378 Battle of Adrianople - Goths defeat Emperor Valens army.
395 Emperor Theodosius divides Roman Empire. Constantinople becomes the capital of the Eastern Roman Empire.
