It was the equivalent of 490 in the times of the ancient Romans but the modern way of writing 490 in Roman numerals is now CDXC
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Under today's rules 490 expressed in Roman numerals is CDXC but the Romans themselves would have probably preferred XD.
988 = CMLXXXVIII in Roman numerals
it means 1,150 in roman numerals
Those Roman Numerals mean 1991.
Not a valid sequence for Roman numerals