The Roman numeral MCCLXXX corresponds to the Arabic number 1280.
MCCLXXX = 1280
Symbols are written and read from left to right, from highest to lowest.
If number MCCLXXX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1280.
MCCLXXIX is number 1279
MCCLXXXI is number 1281
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