The Roman numeral MCDXCI corresponds to the Arabic number 1491.
MCDXCI = 1491
Symbols are written and read from left to right, from highest to lowest.
If number MCDXCI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1491.
MCDXC is number 1490
MCDXCII is number 1492
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