The Roman numeral DCCCXVII corresponds to the Arabic number 817.
DCCCXVII = 817
Symbols are written and read from left to right, from highest to lowest.
If number DCCCXVII is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 817.
DCCCXVI is number 816
DCCCXVIII is number 818
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