Diocletian, Emperor, accession, 5, 45; chooses colleagues, 5; recovers Armenia for Rome 6; attitude toward Galerius, 7, 8; controlling spirit in the Empire, 8; locates his capital, 8, 57; domain, 8; changes introduced by, 9; decentralisation in the provinces, 10; prosperous reign, 11; persecution of the Christians, 12, 24 _ff._, 79, 160; wife and daughters, 13; neutrality toward the Church, 14; neutralitychanged to antagonism, 16, 19; influenced by Galerius, 16, 25, 70, 74; edict against the Manichæans, 22, 23; and Galerius, 23; edicts against the Christians, 26, 99, 134; motive for persecution, 38; abdication, 39, 41, 43; chooses new Cæsars, 40, 41; retires to private life, 40, 46; system of organisation, 50, 65, 66, 74, 123, 242, 311, 330, 331, 337; recognises Carausius, 51; invited to conference at Carnuntum, 63, 64; relations with Constantine, 64; treatment of the Senate, 90; declinesin vitation to wedding of Constantine’s sister, 106; wife and daughter, 118, 119; wishes daughter to live with him, 119; celebrates Vicennalia, 134, 239, 240; proclaims amnesty, 134 Donatist schism, 159-188 Donatists, 159-188; Constantine’s letter to, 180; _raison d’etre_, 183; increase in numbers, 185 Donatus Magnus, leader of Donatist schism, 166, 173, 184, 185 Donatus of Casæ Nigræ, 165 Donatus of Mascula, 161 E Easter, celebration, 231, 232 Education, basis of, 353; and Christianity, 354 Eusebian party, rise, 221; and Nicene Creed, 229, 230; in favour at Imperial Court, 290; confounded at Arius’s death, 299 Eusebius of Cæsarea, on Constantine’s conversion, 93 _ff._; letter of Constantine to, 158; friend of Arius, 196, 214; teachings, 200; on Arian controversy, 206; supports middle party at Council of Nicæa, 221; creed of, 224, 225; signs Nicene Creed, 229, 230; on Constantine’s baptism, death, and burial, 312, 315; on Constantine’s daily life, 317; on Constantine’s religious policy, 320 _ff._ Eusebius of Nicomedia, as historian, 25; _History of the Church_, 27, 71, 97; _Life of Constantine_, 27, 97; champion of Arius, 200 _ff._, 214; calls a synod of Bithynian bishops, 202; attacked by Alexander, 203; leader of middle party at Council of Nicæa, 221; character, 222; and the word “Homoousion,” 224; signs Nicene Creed, 231; exiled, 231, 236; recalled, 287, 288; succeeds Hosius as adviser to Constantine, 290, 300, 316; attack on Athanasius, 291 _ff._; attempt to restore Arius, 291; baptises Constantine, 313 Eustathius, Bishop of Antioch, charges against, 291 Eutropius, on Constantine’s character, 306, 307 F Fausta, wife of Constantine, reveals conspiracy against Constantine, 71; sons, 123; attitude toward Crispus, 238, 243, 244; death, 244, 245, 247 Felix, Bishop of Aptunga, 164, 165, 173