

Roman numerals Summary 
  The Roman numeral system for representing numbers was developed around 500 B.C. As the Romans conquered much of the world that was known to them, their numeral system spread throughout Europe, where Roman numerals remained the primary manner for representing numbers for centuries. 
  Roman numerals are commonly used today in numbered lists (in outline format), clockfaces, pages preceding the main body of a book, chord triads in music analysis, the numbering of movie sequels, book publication dates, successive rulers with identical names, and the numbering of some sport events, such as the Olympic Games or the Super Bowls. 
  Roman numerals remained in common use until about the 14th century, when they were replaced by Arabic numerals (thought to have been introduced to Europe from alAndalus, by way of Arab traders and arithmetic treatises, around the 11th century). 
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