How to use roman numerals<br>Understand the concept of roman numerals. Roman numerals use fewer symbols than the number system you are used to. I is the number 1 (one), v is 5 (five), and x is 10 (ten), for example.
Other people will understand Roman numerals when you use them 
( z1 understand :ARG0 ( z2 person :mod ( z3 other ) ) :ARG1 ( z4 numeral :mod ( z5 country :name ( z6 name :op "Roman" :op "Empire" ) ) ) :time ( z7 use :ARG0 ( z8 you ) :ARG1 z4 ) )