J. H. Kurtz, Church History, Volume 1 (of 3…
“ Diocletian, who survived to A.D. 313, and Maximian, abdicated the imperial rank which they had jointly held in A.D. 305. Their places were filled by those who had been previously their Cæsars, and Galerius as now the chief Augustus proclaimed as Cæsars, Severus and Maximinus Daza, the most furious enemies of the Christians that could be found, so that the storm of persecution which had already begun in some measure to abate, was again revived in Italy by Severus and in the East by Maximinus. ”
