December 21 is the 355th day of the year (356th in leap years) in the Gregorian calendar; 10 days remain until the end of the year. == Events == === Pre-1600 === AD 69 – The Roman Senate declares Vespasian emperor of Rome, the last in the Year of the Four Emperors.
December 21 is the 355th day of the year (356th in leap years) in the Gregorian calendar; 10 days remain until the end of the year. == Events == === Pre-1600 === AD 69 – The Roman Senate declares Vespasian emperor of Rome, the last in the Year of the Four Emperors.
Source: Wikipedia "December 21" · CC BY-SA 4.0
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