The Roman numeral MDXCIX corresponds to the Arabic number 1599.
MDXCIX = 1599
Symbols are written and read from left to right, from highest to lowest.
If number MDXCIX is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1599.
MDXCVIII is number 1598
MDC is number 1600
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