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100 or one hundred (Roman numeral: C) is a common year of the Gregorian calendar. It started on a Friday.
It is one of only seven years to use just one Roman numeral. The seven are 1 AD (I), 5 AD (V), 10 AD (X), 50 AD (L), 100 AD (C), 500 AD (D), and 1000 AD (M).