life of Constantine By EmilyEEE 272 Constantine was born 293 Constantius is made Caesar under Emperor Diocletian 303 Constantine witnesses the "Great Persecution." 305 diocletian and galerius concurrently abdicate as emperor 306 Constantius died 306 Maxentius rebels against Constantine 307 Constantine married Fausta, Maxentius's sister 308 Galerius called a council to resolve the dispute 311 Galerius ends the percussion of Christians 311 Constantine speaks to God in a dream 312 Constantine takes the sigil of the Christian cross in battle 313 Constantine becomes Christian 313 Constantine agrees the to Edict of Milan 324 Constantine wins the battle of the Chrosopolis 324 Defeated Licinius and became the leader of United Rome 325 Constantine begins the First Council of Nicea 330 Constantine renames Byzantium Constantinople 330 Constantine dies