299Persia cedeslarge areas to Romeand Armenia
300?Himyar conquersHadramawt
Feb 303–Apr 311Widespread persecutionof Christians underDiocletian and Galerius
May 305Diocletian and Maximianresign in favor ofConstantius and Galerius
Jul 306Constantine succeedsConstantius
306Galerius recognizesSeverus as Augustusand Constantine as Caesar
Oct 306Maximian’s son Maxentiusseizes power in Rome
Oct–Nov 306Italy and Africadeclare for Maxentius