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Royal Names An ordinal number is a word representing rank or sequential order. The naming convention for royal names is to follow a first name with an ordinal number, which is essentially a Roman numeral used to indicate the birth order of two people having the same name. The Roman numerals from 1 to 50 are defined as follows: . The respective numerals corresponding to numbers 1 through 10 are . The respective numerals corresponding to the numbers 20, 30, 40, and . The numeral for any other two-digit number