299Persia cedes large areasto Rome and Armenia
299Galerius defeatsBastarnae and Carpi
299–300?Galerius defeatsMarcomanni andSarmatians
301Armenia adoptsChristianity
301Diocletian unsuccessfullyattempts to control pricesin Roman Empire
302–304Galerius defeatsCarpi and Sarmatians
302?Constantius defeatsAlemanni at Lingones