These are all the letters and their value~ I(1), V(5), X(10), L(50), C(100), D(500), and M(1,000). Also, if you put a small horizontal line over any number, then you multiply it by 1,000.
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Roman numerals are letters because i said so
Letters are not numbers. Not all letters in the alphabet represent Roman numerals though some letters do.
As any other roman numerals...with letters.
In roman letters it is MMMMMMMMMDCCXCVII.
There are no Roman numerals which are represented by the letters Y, E or S.