Roman numerals are better known today than any other ancient system of numeration. Originating in ancient Rome, the system they developed remained a primary system of numeration for many centuries, and after a slight modification in the Middle Ages, continues to see some specialized use today. The primary distinction between the Roman and Arabic numerals we use today, is that Romans didn't have a symbol to signify zero, and that numeral placement within a number can sometimes indicate subtraction (IX) rather than addition (XI).

Roman numerals are most commonly used today in the numbering of movie sequels (Star Trek IV: The Voyage Home, Star Wars: Episode VI - Return of the Jedi, The Godfather: Part II); the numbering of some sporting events, such as the Olympic Games or the Super Bowls; the order of rulers, popes or ships who share the same name (Pope John Paul II, King George VI, Queen Elizabeth II); volumes or chapters in a book, publishing industry copyright dates, production dates seen at the end of motion picture credits, some historic events (World War I, World War II), and clocks with Roman numeral clockfaces.

Roman numerals are usually written in upper-case letters (I, II, III, X, and XXV). Occasionally Roman numerals are written using lower-case letters (i, ii, iii, x, and xxv), particularly when numbering paragraphs or sections within chapters, or for the pagination of the front matter of some books.

Below you will find Roman numerals and their Arabic numeral equivalents listed chronologically 1 (one) through 100 (one hundred), as well as Roman numeral dates shown in chronological order from 100 - 2100.

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