Severus Diocletian, suffering from a debilitating sickness, retires. Galerius takes over. Maximinus (Galerius's nephew) 306 Constantius dies in York, Britain. Severus takes over in Milan. Constantine (Constantius's son) is nominated by troops to be Augustus, but accepts post of Caesar following Galerius's insistence on Severus. Maxentius is nominated by the army