Constantine defeats Licinius at Chrysopolis, ending the eastern colleague in war
In 324 Constantine defeated Licinius at Adrianople and Chrysopolis (18 September 324 in received chronology), ending the last tetrarchic colleague in open war and taking the East. In the causal graph this event strengthens Forced-Displacement Scale, a driver that strengthens People Internally Displaced by Conflict and Violence (IDMC) — a worsening welfare path.
Read the full account
In 324 Constantine defeated Licinius at Adrianople and Chrysopolis (18 September 324 in received chronology), ending the last tetrarchic colleague in open war and taking the East. Troops and cities were moved as the prize.
Context
The 313 Milan agreement had been a joint instrument. 324 cancelled that partnership by force. Displacement of a court and its dependents is the path.
Constantine the Great’s documented role is bounded by other offices and collaborators named in the sources below.
Cibalae 316 and the 324 campaign are received civil wars. Licinius was later executed despite an amnesty story. Shared armies, his command.
Why it matters
Destroying a co-emperor’s regime by campaign is a forced-displacement and war path, not a church council.
Licinius’s later execution is its own row.
Who was responsible
Contribution type and responsibility level for each recorded actor — not sole-author shorthand.
Constantine the Great
PersonDirect responsibility
responsibility level 0.8 · verified
What changed
Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.
- FactConstantine defeats Licinius at Chrysopolis, ending the eastern colleague in war
- strengthensDriverForced-Displacement Scale
- strengthensIndicators (2)People Internally Displaced by Conflict and Violence (IDMC)
impact weight 0.5 · Effect from 18 September 324 · verified
Destroying a co-emperor’s regime by campaign is a forced-displacement and war path, not a church council.
Strengthens · Relationship strength 0.4 (weight 0.5 × strength 0.8)
Observed
69M people (stock, end-of-year) · 28M above the normal line (2025)
Worse than normal3 readings, 2023–2025: rose from 68M people (stock, end-of-year) to 69M people (stock, end-of-year).
Above normal = worse
- Worse
Strengthens · Relationship strength 0.23 (weight 0.5 × strength 0.46)
Observed
10.4% · 10.2 above the normal line (2024)
Worse than normal7 readings, 2018–2024: fell from 11.1% to 10.4%.
Above normal = worse
Evidence
The sources behind this fact and its verification state.
- 1.Britannica — Constantine IEncyclopaedia Britannica · High credibility · verified
- 2.Eusebius, Life of Constantine — New AdventNew Advent · High credibility · verified
What the sources establish
Britannica’s Constantine biography and Cambridge Ancient History independently narrate the 316/324 wars; Eusebius celebrates, which is a bias flag.
Established: received 324 victory over Licinius at Chrysopolis. Not established: that every eastern Christian was safer the next morning.
Causal path
How this event connects to drivers and indicators in the graph.
- ActorConstantine the Great
- contributed toFactConstantine defeats Licinius at Chrysopolis, ending the eastern colleague in war
- strengthensDriverForced-Displacement Scale
- strengthensIndicatorPeople Internally Displaced by Conflict and Violence (IDMC)
Cite this page
Factrail. (2026). Constantine defeats Licinius at Chrysopolis, ending the eastern colleague in war. Factrail. https://factrail.ai/facts/co-licinius-wars
https://factrail.ai/facts/co-licinius-wars
Accessed 16 October 2026.
By the Factrail desk · Method: how we source and score · Last reviewed
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