Remarks:
 Constantine I Flavius Valerius Augustus or Constantine I the Great, Roman Emperor.  Brought Christianity to Rome as official religion. Divided lands between his three sons, Constantine II, Constantius II and Constans I.  From prior relationship with concubine Minervina, son Crispus was born.  When Constantine suspected Crispin of adultery with his wife Fausta in later years, both were put to death. 
  
 Constantine was born in Naissus, Upper Moesia, on 27 February in roughly AD 285. Another account places the year at about AD 272 or 273. He was the son of Helena, an inn keeper's daughter, and Constantius Chlorus. It is unclear if the two were married and so Constantine may well have been a natural child.  
  
 306 Constantine declared co-Augustus after death of his father Constantius Chlorus, but Galerius recognizes the Illyrian Severus in that rank and confers the title of Caesar on Constantine  
 306 Maxentius, son of Maximian, hailed as legitimate successor by the Praetorian Guard and the city of Rome; heads revolt against Constantine. His father comes out of retirement to profit from the situation, first on one side, then on the other  
 308 At an imperial conference of Diocletian, Galerius and Maximian at Carnuntum Licinius is declared Augustus of teh West, setting off an armed conflict between all rival contenders  
 310 Maximius Daia, nephew of Galerius, assumes on his own initiative the title of Augustus  
 311 An edict of tolerance for Christians issued by Galerius shortly before his death  
 312 Constantine's victory over Maxentius in battle at the Milvian Bridge puts Rome in his hands  
 313 Victory of Licinius over Maximinus Daia at the Hellespont is followed by reconciliation of the two victors  
 313 The co-emperors issue the Edict of Milan ending persecution of Christians  
 314 Armed conflict breaks out between the co-emperors: truces, claims, counterclaims, and wars follow for ten years with Constantine increasingly victorious  
 324 Constantine sole emperor after final defeat, abdication, and execution of Licinius  
 325 The Council of Nicaea formulates Nicene Creed and makes Christianity the religion of the Empire 
 326 Constantine chooses Byzantium as the new capital of the Empire and renames it Constantinopolis  
 337 May 22, death of Constantine the Great 
  
 Constantine I Flavius Valerius Augustus or Constantine I the Great, Roman Emperor.  Brought Christianity to Rome as official religion. Divided lands between his three sons, Constantine II, Constantius II and Constans I.  From prior relationship with concubine Minervina, son Crispus was born.  When Constantine suspected Crispin of adultery with his wife Fausta in later years, both were put to death. 
  
 Constantine was born in Naissus, Upper Moesia, on 27 February in roughly AD 285. Another account places the year at about AD 272 or 273. He was the son of Helena, an inn keeper's daughter, and Constantius Chlorus. It is unclear if the two were married and so Constantine may well have been a natural child.  
  
 306 Constantine declared co-Augustus after death of his father Constantius Chlorus, but Galerius recognizes the Illyrian Severus in that rank and confers the title of Caesar on Constantine  
 306 Maxentius, son of Maximian, hailed as legitimate successor by the Praetorian Guard and the city of Rome; heads revolt against Constantine. His father comes out of retirement to profit from the situation, first on one side, then on the other  
 308 At an imperial conference of Diocletian, Galerius and Maximian at Carnuntum Licinius is declared Augustus of teh West, setting off an armed conflict between all rival contenders  
 310 Maximius Daia, nephew of Galerius, assumes on his own initiative the title of Augustus  
 311 An edict of tolerance for Christians issued by Galerius shortly before his death  
 312 Constantine's victory over Maxentius in battle at the Milvian Bridge puts Rome in his hands  
 313 Victory of Licinius over Maximinus Daia at the Hellespont is followed by reconciliation of the two victors  
 313 The co-emperors issue the Edict of Milan ending persecution of Christians  
 314 Armed conflict breaks out between the co-emperors: truces, claims, counterclaims, and wars follow for ten years with Constantine increasingly victorious  
 324 Constantine sole emperor after final defeat, abdication, and execution of Licinius  
 325 The Council of Nicaea formulates Nicene Creed and makes Christianity the religion of the Empire 
 326 Constantine chooses Byzantium as the new capital of the Empire and renames it Constantinopolis  
 337 May 22, death of Constantine the Great