1 in Roman Numerals

The number 1 is written I in Roman numerals. Reading left to right and adding the values gives 1 = 1. Roman numerals use seven letters: I (1), V (5), X (10), L (50), C (100), D (500) and M (1000). A smaller letter before a larger one means subtraction (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900).

I in names

• Elizabeth I of England, Queen of England and Ireland from 1558 to 1603 (1533-1603). Wikidata
• John Paul I, pope of the Catholic Church in 1978. Wikidata
• Juan Carlos I of Spain, King of Spain from 1975 to 2014. Wikidata
• Gregory I, 6th-century Roman Pope, theologian and Church Father, Catholic and Orthodox saint, 64th Bishop of Rome and Doctor of the Church. Wikidata
• Richard I of England, King of England from 1189 to 1199 (1157–1199). Wikidata
• Charles I of England, King of England, Scotland, and Ireland from 1625 to 1649 (1600-1649). Wikidata
• Alexander I of Russia, The tenth Emperor of Russia (1777–1825). Wikidata
• Nicholas I of Russia, The 11th Emperor of Russia, 1825–1855 (lived 1796-1855). Wikidata
• Isabella I of Castile, queen of the Crown of Castile, from 1474 to 1504; first queen of a dynastically-united Spain, from 1479 to 1504 (1451–1504). Wikidata
• Mary I, Queen of England and Ireland from 1553 to 1558 (1516-1558). Wikidata
• Franz Joseph I of Austria, Emperor of Austria and King of Hungary (1830-1916). Wikidata
• Leo I, Pope from 440 to 461 (390–461). Wikidata

Popes, monarchs, films and Super Bowls whose name carries I. Source: Wikidata, retrieved 11 October 2026.

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