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1700th anniversary: The First Council of Nicaea, the first ecumenical council of the Christian...

Tue, May 20, 2025

18 mo ago

Source

In 325, The First Council of Nicaea, the first ecumenical council of the Christian Church, was formally opened by Constantine the Great.

Also on May 20, 2025

Source, method and history
Source
Wikipedia
How we know
Wikipedia "On this day" selected anniversary, 1700 years (325 to 2025).
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annual
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None recorded.