Pashure Diocletian akarega basa musi wa 1 May 305, vatevedzeri vake vakatanga kurwira kudzora Roman Empire anenge pakarepo. Zvisinei Constantine aiva mwanakomana Western Emperor Constantius, Tetrarchic mafungiro haana hazvo kupa dzinza nhaka. Apo Constantius akafa musi wa 25 July 306, mauto baba vake akazivisa Constantine sezvo Augustus muna Ebora (York).
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