May 20 is the 140th day of the year (141st in leap years) in the Gregorian calendar; 225 days remain until the end of the year. == Events == === Pre-1600 === 325 – The First Council of Nicaea is formally opened, starting the first ecumenical council of the Christian Church.
May 20 is the 140th day of the year (141st in leap years) in the Gregorian calendar; 225 days remain until the end of the year. == Events == === Pre-1600 === 325 – The First Council of Nicaea is formally opened, starting the first ecumenical council of the Christian Church.
Source: Wikipedia "May 20" · CC BY-SA 4.0
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