Constantine the Great

Historical eventJuly 25306

Constantine the Great

Constantine the Great was proclaimed Roman emperor by his troops after the death of Constantius Chlorus.

Everything on July 25Original source

In context

When
Thursday, July 25 3061720 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
4th century · 300s
Calendar
Julian — as recorded at the time
Recorded from
Wikipedia “On this day” feed

Dates before 15 October 1582 are in the Julian calendar, so the weekday shown follows the Julian reckoning of the time.

At a glance

Dates: From 306.

What happened

Constantine the Great was proclaimed Roman emperor by his troops after the death of Constantius Chlorus.

July 25 through the years

Other entries on the same calendar day, in order.

  1. 306Constantine the Great
  2. 19951995 France bombings
  3. 19961996 Burundian coup d'état
  4. 2000Air France Flight 4590
  5. 2000Concorde
  6. 2001Phoolan Devi
  7. 2007Pratibha Patil
  8. 2010WikiLeaks
  9. 20182018 Suwayda attacks
  10. 20192019 European heatwaves
  11. 2022Duffield Memorial

Sources

Cite this page

“Constantine the Great”, What's On This Date, https://whatsonthisdate.com/app/event/constantine-the-great-306-july-25, accessed October 29, 2026.

Cite the underlying source as well — the source links above go to the record this entry is adapted from.

Questions about this entry

When did Constantine the Great happen?

July 25 306 — 1720 years ago, on a Thursday.

Is this a Julian or a Gregorian date?

It is the date as recorded at the time, on the Julian calendar. The Gregorian equivalent falls about ten days later; sources from different countries may give either.

Where does this text come from?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

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