Constantine (; ) was born in Naissus (Niš, Serbia). He was born on 27 February. The "Calendar of Philocalus" and the works of the Latin writer Polemius Silvius both say Constantine was born in 272 or 273. The Latin historian Eutropius wrote the same information. However, the Greek historian and bishop Eusebius of Caesarea wrote that Constantine was born around the year 285.