Reign of Diocletian & associates, Maximian, Galerius & Constantius— General re-establishment of order & tranquility; Persian war, victory & triumph — New form of administration — Abdication & retirement of Diocletian & Maximian
| AD | Event |
| 285 | Elevation & Character of Diocletian Clemency in Victory |
|---|---|
| 286 | Association & Character of Maximian |
| 292 | Association of Caesars, Galerius & Constantius; Departments & Harmony of 4 Princes— Events |
| 287 | State of Peasants of Gaul— Their Rebellion & Chastisement; Revolt of Carausius in Britain— Importance of Britain; Power of Carausius |
| 289 | Acknowledged by other Emperors |
| 294 | His Death |
| 296 | Recovery of Britain by Constantius —Defence of Frontiers; Fortifications— Dissensions of the Barbarians; Conduct of Emperors; Valour of Caesars; Treatment of Barbarians; Wars of Africa & Egypt; Conduct of Diocletian in Egypt; suppresses Books of Alchymy; Novelty & Progress of that Art; Persian War |
| 282 | Tiridates the Armenian |
| 286 | His Restoration to the Throne of Armenia; State of the Country; Revolt of People & Nobles; Story of Mamgo; Persians recover Armenia |
| 296 | War between the Persians Romans; Defeat of Galerius— His Reception by Diocletian |
| 297 | 2nd Campaign of Galerius;Victory & Behaviour to his Royal Captives; Negotiation for Peace— Speech of Persian Ambassador; Answer of Galerius—Moderation of Diocletian; Conclusion of Peace Treaty — articles of Treaty; Aboras fixed as the Limits between the Empires; Cession of 5 Provinces beyond the Tigris— Armenia; Iberia |
| 303 | Triumph of Diocletian & Maximian; Long Absence of Emperors from Rome; Their Residence at Milan & Nicomedia; Debasement of Rome and the Senate; New Bodies of Guards, Jovians & Herculians; Civil Magistracies laid aside; Imperial Dignity & Titles; Diocletian assumes Diadem, introduces Persian Ceremonial; New Form of Administration, 2 Augusti & 2 Caesars; Increase of Taxes; Abdication of Diocletian & Maximian— Resemblance to Charles V |
| 304 | Long Illness of Diocletian; His Prudence; Compliance of Maximian; Retirement of Diocletian at Salona— His Philosophy |
| 313 | & Death; Description of Salona & adjacent Country—Diocletian's Palace; Decline of Arts; of Letters; new Platonists |