499 in Roman numerals: CDIC
Today it is written out as: CDXCIX
But during the Roman era it was most probably wrote as: ID (-1+500 = 499)
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Nowadays 499 in Roman numerals is now considered to be CDXCIX but the ancient Romans would have simply worked it out as ID meaning 500-1 = 499
In todays notation of Roman numerals they represent 499
The Roman numeral representation of 499 is CDXCIX, which can be broken down as follows: CD (400) + XC (90) + IX (9).
In accordance with today's rules it is CDXCIX But the Romans themselves in the past probably wrote it out simply as ID (-1+500=499)
In today's notation it is: 499 = CMXCIX But the Romans themselves would have probably worked out the equivalent of 499 on an abacus counting device as CCCCLXXXXVIIII and by placing I to both sides of these numerals simplified them to ID (-1+500=499) The rules governing the Roman numeral system were changed in the Middle Ages presumably to make it easier for them to be converted into Hindu-Arabic numerals that were gradually being introduced into Western Europe.