The Roman numeral MCMLV represents the number 1955
mcmlv....1955 -mccxi....1211 ____________ dccxliv....744
Xii - xxi - mcmlv
1955
1955
1955
1955
In today's modern usage of Roman numerals MCMLV is equivalent to 1955 but the ancient Romans would have notated it as MDCCCCLV
It means 1955
In today's notation they represent:- 1955
Xi xix mcmlv should be all caps, this website changes them sometimes
As the ancient Romans would read it 2155.As we would read it (using shorthand rules added in the Middle Ages): 1955.