Major Dates

  • Proclaimed Augustus under tetrarchy by his troops in York after his father Constantius died in 306 AD
  • Tetrarch civil war 306-324 AD between Constantine, Galerius, Maximian, Maximinus, Licinius, Maxentius
  • Edict of Toleration 311 AD to end Christian persecution
  • Edict Milan in 313 AD–Christian toleration
  • Defeats Licinius 324 AD and gains sole control–End of tetrarchy
  • Proclaims Byzantium (later renamed Constantinople) capital in 324 A.D.
  • Died 337 AD