Under today's rules now governing the Roman numeral system 399 when converted into Roman numerals is now considered to be CCCXCIX but the ancient Romans would have notated it quite differently.
399 is CCCXCIX.
399 in Roman Numerals is: CCCXCIX
399
In todays notation of Roman numerals they represent 399
988 = CMLXXXVIII in Roman numerals
399 is CCCXCIX.
399 in Roman Numerals is: CCCXCIX
399
In todays notation of Roman numerals they represent 399
it means 1,150 in roman numerals
988 = CMLXXXVIII in Roman numerals
Not a valid sequence for Roman numerals
Those Roman Numerals mean 1991.
It does not mean anything because it is an invalid arrangement of Roman numerals
"D" in Roman Numerals equals 500.
In Roman numerals, it means N M C.
Roman numerals don't have a 0 symbol and so it is an invalid arrangement of Roman numerals