# Diocletian The first fact about Diocletian is that administrative stabilization and religious-rights destruction are both dated, and neither cancels the other. Start with 24 February 303. Britannica’s Great Persecution (https://www.britannica.com/topic/Great-Persecution), Lactantius (https://www.newadvent.org/fathers/0705.htm), and Eusebius (https://www.newadvent.org/fathers/2501.htm) independently date the first edict: churches down, scriptures burned, honestiores stripped. Later edicts demanded sacrifice. Implementation differed: Constantius in the West was lighter; Galerius and Maximinus in the East ran the killing-machine. Cambridge Ancient History (https://www.cambridge.org/core/books/cambridge-ancient-history/) treats that variation as real. Variation is not a finding that the senior Augustus did not sign. Write burning and torture. Do not write ‘religious policy’ as a softening. The Price Edict of 301 (fragments via https://droitromain.univ-grenoble-alpes.fr/) is a tariff with death threats. It is also, later, an economic-history file. Split those rows. The census-tax (iugatio/capitatio) is a machine Lactantius hates and moderns reconstruct; extraction and state capacity share a spine — split them. 302’s Manichaean edict rhymes with 303 in method. Offsets that survive the martyr file: 293 tetrarchy as a frontier college (https://www.britannica.com/topic/tetrarch-Roman-official; Livius https://www.livius.org/articles/person/diocletian/); smaller provinces and dioceses; rebuilt frontiers versus the 260s; 1 May 305 abdication, rare among Augusti; the retirement palace now a living city listed by UNESCO (https://whc.unesco.org/en/list/97/; https://www.split.hr/en; https://www.diocletianspalace.org/). Coin reform as attempt and as shock, split. Gregorian/Hermogenian collections as copyable law, not as an independent bench. What the score must not say: that 303 was mild because Gaul was lighter; that UNESCO Split rebates scripture-burning; that the Price Edict lowered a CPI; that abdication undid the edicts; that Lactantius is a tape of inner pride; that he is Constantine (who halted persecution in his zone from 306). Confidence is high on 284, 293, 301, 303, 305 as received chronology and on UNESCO, medium on tax-welfare sign and on martyr totals, low on anecdotal Alexandrian massacre numbers. Related people: Maximian; Galerius as persecution driver in Lactantius; Constantius Chlorus as lighter western implementer; Constantine as successor who reversed the edicts in his lands; Lactantius and Eusebius as narrators; Carinus as civil-war rival; later [Charlemagne](/people/charlemagne) as a western imperial reader of Roman office; [Marcus Aurelius](/people/marcus-aurelius) as an earlier philosophical princeps in school contrast. Keep 284, 293, 301, 303, and 305 on separate dates. Remaining dated instruments kept after dropping later editions, museums, and split rows: 0284-11-20 Diocletian is acclaimed after Numerian’s death, opening a civil war with Carinus; 0303-02-24 The first Great Persecution edict of 24 February 303 orders churches demolished and scriptures burned; 0304-01-01 Later persecution edicts demand universal sacrifice, with torture and killing of refusers as received; 0301-12-01 The Edict on Maximum Prices threatens death for exceeding ceilings, a coercive market police; 0293-03-01 Tetrarchic ceremonial (proskynesis, Jovian/Herculian titles) sacralises living rulers; 0297-01-01 A new census and iugatio/capitatio tax machine extracts more regularly from land and heads; 0300-01-01 Later codes show hereditary binding of coloni and some trades as tetrarchic-era coercion; 0302-03-31 A 302 edict against Manichaeans orders leaders burned and books destroyed; 0293-01-01 Tetrarchic army and frontier multiplication raises the extractive burden on the tax machine; 0305-05-01 The 1 May 305 abdication produces a succession that collapses into civil war by 306; 0286-04-01 Maximian is made co-Augustus; the West gets a second coercive court; 0297-01-01 Diocletian suppresses Egyptian revolt, with received slaughter at Alexandria and a later ‘Pompeian’ caption; 0293-06-01 Nicomedia, Trier, Milan, and Sirmium as tetrarchic capitals extract building and court costs from regions; 0294-01-01 Tetrarchic coin reform includes shocks and failures beside later stabilization claims; 0293-03-01 The 293 tetrarchy creates a four-emperor college as a succession-and-defence design; 0297-06-01 Provinces are split and grouped into dioceses under vicarii, an administrative redesign; 0294-06-01 Frontier forts and a more mobile field force are rebuilt as a defence instrument; 0298-01-01 Relative to 249–284, the years 284–305 are a received stabilization of frontiers and office; 0295-01-01 Gregorian and Hermogenian codes in the tetrarchic years make constitutions copyable as a law file; 0305-06-01 The Split palace becomes, in later centuries, the core of a living city rather than a sealed tomb. Later Loeb, UNESCO, and encyclopedia pages are evidence, not additional acts. ## Dated facts - Diocletian’s later political interventions, including Carnuntum 308, fail to restore the college. https://factrail.ai/facts/di-later-intervention-failure-as-limit. Sources: https://www.britannica.com/biography/Diocletian, https://www.livius.org/articles/person/diocletian/. - 305: The Split palace becomes, in later centuries, the core of a living city rather than a sealed tomb. https://factrail.ai/facts/di-palace-as-urban-continuity. Sources: https://www.diocletianspalace.org/, https://whc.unesco.org/en/list/97/. - The 1 May 305 abdication produces a succession that collapses into civil war by 306. https://factrail.ai/facts/di-abdication-failure-path. Sources: https://www.britannica.com/biography/Diocletian, https://www.newadvent.org/fathers/0705.htm. - 304: Later persecution edicts demand universal sacrifice, with torture and killing of refusers as received. https://factrail.ai/facts/di-later-edicts-sacrifice. Sources: https://www.britannica.com/topic/Great-Persecution, https://www.newadvent.org/fathers/2501.htm. - Constantius’s lighter western implementation is stored so 303 is not a uniform tape of the college. https://factrail.ai/facts/di-constantius-lighter-west-as-limit. Sources: https://www.britannica.com/topic/Great-Persecution, https://www.newadvent.org/fathers/0705.htm. - The first Great Persecution edict of 24 February 303 orders churches demolished and scriptures burned. https://factrail.ai/facts/di-great-persecution-303. Sources: https://www.britannica.com/topic/Great-Persecution, https://www.newadvent.org/fathers/0705.htm. - A 302 edict against Manichaeans orders leaders burned and books destroyed. https://factrail.ai/facts/di-manichaean-edict. Sources: https://www.newadvent.org/cathen/05007b.htm, https://www.cambridge.org/core/books/cambridge-ancient-history/. - 301: The Edict on Maximum Prices threatens death for exceeding ceilings, a coercive market police. https://factrail.ai/facts/di-price-edict-coercion. Sources: https://droitromain.univ-grenoble-alpes.fr/, https://www.cambridge.org/core/books/cambridge-ancient-history/. - 300: Diocletian builds the fortified retirement palace at Split as a lifetime coastal seat, not a later UNESCO listing. https://factrail.ai/facts/di-split-palace-build. Sources: https://www.britannica.com/place/Palace-of-Diocletian, https://www.britannica.com/biography/Diocletian. - 300: Later codes show hereditary binding of coloni and some trades as tetrarchic-era coercion. https://factrail.ai/facts/di-hereditary-occupations. Sources: https://droitromain.univ-grenoble-alpes.fr/, https://www.cambridge.org/core/books/cambridge-ancient-history/. - 299: Christians are dismissed from army and court after a failed sacrifice, a pre-303 purge distinct from the February edict. https://factrail.ai/facts/di-army-purge-299. Sources: https://www.britannica.com/biography/Diocletian, https://www.livius.org/articles/person/diocletian/. - 298: Tetrarchic road and fort programmes leave a public infrastructure heading. https://factrail.ai/facts/di-roads-and-forts-as-infrastructure. Sources: https://www.livius.org/articles/person/diocletian/, https://www.cambridge.org/core/books/cambridge-ancient-history/. ## Methodology https://factrail.ai/methodology Canonical: https://factrail.ai/people/diocletian