Constantine is born Flavius Valerius Constantinus in the city of Naissus around February 27, 272. His father, Flavius Constantius, is a skilled politician, soldier, and bodyguard to Emperor Aurelian. His mother, Helena, is of low social rank.
293
Constantius is made Caesar under Emperor Diocletian(March 1, 293).
303
Constantine witnesses the "Great Persecution."
305
Diocletian and Galerius concurrently abdicate as emperors
311
Galerius ends the persecutions of Christians
312
Constantine takes the sigil of the Christian cross in battle