Roman numerals 1-30 vertical

Answer 1

In today's terms the Roman numerals from 1-30 are as follows with some interesting facts:

I

II

III

IV formerly IIII

V

VI

VII

VIII formerly IIX as still used in parts of Spain today

IX formerly VIIII

X

XI

XII

XIII

XIV formerly XIIII

XV

XVI

XVII

XVIII formerly IIXX

XIX formerly XVIIII or IXX

XX

XXI

XXII

XXIII

XXIV formerly XXIIII

XXV

XXVI

XXVII

XXVIII formerly IIXXX

XXIX formerly IXXX or XXVIIII as can be seen in the ruins of the Coliseum in Rome

XXX

The rules governing today's Roman numeral system were made up during the Middle Ages centuries after the decline of the Roman Empire.