Constantine: Roman Emperor & Christian Conversion (+ 7 more historical events on this day!)

A Daily Dose of History: Events on this Day in History · Jul 25, 2025 · 6m

A Daily Dose of History (25 Jul 2025)

Today's historical events:

Constantine I is proclaimed Roman emperor by his troops.

Climax of the Siege of Thessalonica by the Slavs in a three-day assault on the city walls.

The Edict of Pistres of Charles the Bald orders defensive measures against the Vikings.

Eleanor of Aquitaine marries Prince Louis, later King Louis VII of France, at the Cathedral of Saint-André in Bordeaux.

Battle of Ourique: The Almoravids, led by Ali ibn Yusuf, are defeated by Prince Afonso Henriques who is proclaimed King of Portugal.

The city of Constantinople is recaptured by…