The only real change to the Roman Numerals happened in the Middle Ages when "lazy" monks created the shorthand form that we use today.
For example in the system as used by the Romans both VI and IV were the same number: six. But as the "lazy" monks modified it now IV instead represents four (which the Romans would have always written as IIII). This example applies to all the Roman Numeral characters that are multiples of ten (e.g. I, X, C, M).
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D in Roman numerals is equal to 500 at one time 500 was expressed as I) meaning 1*500 over time they were merged to today's D.
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Because at one time 500 was represented by I) meaning 1*500 and over time it became D
In Europe, the Hindu-Arabic numerals gradually displaced the Roman numerals over a long period, from about 1000 AD to about 1500 AD. After that time, Roman numerals were no longer used in calculations. Roman numerals remained in use in "official" contexts, such as dates on the foundation stones of buildings, up to very recently. They are also still used in the names of monarchs (Queen Elizabeth II, Louis XIV of France), and Popes (Pope Pius X). Also the introductory pages of books are often labelled with Roman numerals. = =
In our time it is the year 1924