Constantine is hailed emperor at Eburacum (York), controls Spain, Gaul, Germany and Britain - AD 306
Constantine defeats Maxentius at the Milvian Bridge, gains control of Italy, Raetia and North Africa - AD 312
Constantine conquers the dioceses Pannoniae and Moesia from Licinius - AD 316/317
Constantine defeats Licinius and gains entire empire for himself - AD 324
Constantine continued many reforms begun by Diocletian and further split serval provinces into smaller units.