In today's modern notation MCDXCIX are Roman numerals that represent 1499 (1000+400+90+9 = 1499)
But the Romans themselves would have probably calculated 1499 on an abacus counting device as MCCCCLXXXXVIIII and by adding I to the right hand side and subtracting I from the left hand side of these numerals simply wrote it out as IMD (-1+1500 = 1499)
Today's rules governing the Roman numeral system were introduced during the Middle Ages and that was centuries after the decline of the Roman Empire.
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1499 (m= 1000 cd= 400 xc=90 ix=9)
In today's modern notation of Roman numerals it is now 1499 = MCDXCIX but the ancient Romans would have worked it out on an abacus calculating board as MCCCCLXXXXVIIII and then probably abridged it to IMD in written format which means 1500-1 = 1499
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