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Nicaea 325 AD: Birth of Christian Orthodoxy (+ 13 more historical events on this day!)
A Daily Dose of History (20 May 2026)
Today's historical events:
The First Council of Nicaea is formally opened, starting the first ecumenical council of the Christian Church.
Empress Ariadne marries Anastasius I. The widowed Augusta is able to choose her successor for the Byzantine throne, after Zeno (late emperor) dies of dysentery.
The Battle of Dun Nechtain is fought between a Pictish army under King Bridei III and the invading Northumbrians under King Ecgfrith, who are decisively defeated.
While visiting the royal Mercian court at Sutton Walls with a view to marrying princess Ælfthryth…
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