Roman Numerals in French
Louis XIV, le XXIe Siècle, Chapitre III
Updated May 2026
French uses Roman numerals systematically in several specific contexts where Arabic numerals would feel out of place: French monarchs and dynastic names (Louis XIV, Henri IV, Napoléon III), centuries (le XXIe siècle), popes (Jean-Paul II, Benoît XVI), republics and historical periods (la Ve République, le IIIe Reich), book chapter and section numbers, and Paris arrondissements (le Ve arrondissement). The convention is more pervasive in formal French writing than in English; a French history textbook will use Roman numerals for monarchs and centuries throughout, while an English equivalent might switch to Arabic numerals for readability.
The reading rule depends on context. Roman numerals after a personal name (a monarch, a pope) are read as cardinal numbers (Louis quatorze, not Louis the Fourteenth). Roman numerals after a noun like siècle, arrondissement, or chapitre are read as ordinals (le vingt et unième siècle, le cinquième arrondissement, le troisième chapitre). The first position is always premier or première regardless of what comes after. This page covers the symbol system, the reading rules, the contexts where Roman numerals appear, and the typographic conventions for the superscript e ordinal notation.
The Symbol System
Roman numerals use seven letters: I (1), V (5), X (10), L (50), C (100), D (500), M (1000). Numbers are formed by combining these letters according to additive and subtractive rules. A smaller letter before a larger one is subtracted (IV = 5 - 1 = 4, IX = 10 - 1 = 9, XL = 50 - 10 = 40, XC = 100 - 10 = 90, CD = 500 - 100 = 400, CM = 1000 - 100 = 900). A smaller letter after a larger one is added (VI = 5 + 1 = 6, XV = 10 + 5 = 15, LX = 50 + 10 = 60).
The same symbol cannot be repeated more than three times in a row, except for the M (which historically can appear up to four times for years like MMMM = 4000, though this is rare and modern usage often uses the overline notation for 4000+). So 4 is IV, not IIII; 9 is IX, not VIIII; 40 is XL, not XXXX; 400 is CD, not CCCC. Some clock faces use IIII for 4 instead of IV for visual balance with VIII; this is an aesthetic exception not used in numerical contexts.
The current year, 2026, in Roman numerals: MMXXVI (M = 1000, M = 1000, X = 10, X = 10, V = 5, I = 1; sum = 2026). Year 2025: MMXXV. Year 1945 (end of WWII): MCMXLV (M + CM + XL + V = 1000 + 900 + 40 + 5 = 1945). Year 1789 (French Revolution): MDCCLXXXIX (M + D + CC + L + XXX + IX = 1000 + 500 + 200 + 50 + 30 + 9 = 1789).
Reading Rule: Cardinal vs Ordinal Depending on Context
After a personal name (monarch, pope, dynastic figure): read as a cardinal number. Louis XIV = Louis quatorze. Henri IV = Henri quatre. Napoléon III = Napoléon trois. Charles X = Charles dix. Jean-Paul II = Jean-Paul deux. Benoît XVI = Benoît seize. The cardinal reading is the dominant convention, established by historical French usage and standardised by the Académie française.
After a noun (siècle, arrondissement, chapitre, section, république, partie): read as an ordinal number. le XXe siècle = le vingtième siècle. le XXIe siècle = le vingt et unième siècle. le Ve arrondissement = le cinquième arrondissement. chapitre III = chapitre trois (or in some contexts troisième chapitre; both heard). la Ve République = la Cinquième République. The ordinal reading reflects the position-in-sequence interpretation: the 20th century is the 20th in a sequence of centuries.
The first position is always premier or première. Louis Ier = Louis premier. François Ier = François premier. Élisabeth Ire = Élisabeth première. le Ier siècle = le premier siècle. la Ire République = la Première République. chapitre Ier = chapitre premier. The form premier / première is the only French ordinal that does not follow the standard -ième pattern (which kicks in from 2nd onward: deuxième, troisième, etc.). The Ier / Ire superscript is the standard typographic mark for the first position.
Reference Table
| Roman | Value | As ordinal | As cardinal | Example |
|---|---|---|---|---|
| I | 1 | premier (1er) | un | Louis Ier (Louis premier), François Ier |
| II | 2 | deuxième (2e) | deux | Henri II, Jean-Paul II |
| III | 3 | troisième (3e) | trois | Napoléon III, IIIe République |
| IV | 4 | quatrième (4e) | quatre | Henri IV, Charles IV |
| V | 5 | cinquième (5e) | cinq | la Ve République (cinquième), le Ve arrondissement |
| VI | 6 | sixième (6e) | six | Louis VI, Benoît XVI |
| X | 10 | dixième (10e) | dix | Charles X, le Xe siècle |
| XIV | 14 | quatorzième (14e) | quatorze | Louis XIV (Louis quatorze), Le Roi-Soleil |
| XVI | 16 | seizième (16e) | seize | Louis XVI (Louis seize), guillotiné en 1793 |
| XIX | 19 | dix-neuvième (19e) | dix-neuf | le XIXe siècle (Romantisme, Révolution industrielle) |
| XX | 20 | vingtième (20e) | vingt | le XXe siècle (deux guerres mondiales, Cinquième République) |
| XXI | 21 | vingt et unième (21e) | vingt et un | le XXIe siècle (notre siècle) |
| L | 50 | cinquantième (50e) | cinquante | Le Ve siècle |
| C | 100 | centième (100e) | cent | CM = 900, CD = 400 |
| M | 1000 | millième (1000e) | mille | MCMXLV = 1945, MMXXVI = 2026 |
Where Roman Numerals Show Up in French Life
Monarchs and historical figures. Every French monarch from Louis I (Louis the Pious, Holy Roman Emperor) through Louis XVIII (the last numbered French king, restored after Napoleon’s fall) is referenced with a Roman numeral. The Capet, Valois, and Bourbon dynasties each restart the numbering: Henri II (Valois) and Henri II of Navarre are different historical figures. School history textbooks consistently use the Roman form: Louis XIV, le Roi-Soleil, règne de 1643 à 1715.
Centuries. French historical writing references centuries with Roman numerals plus superscript ordinal mark: le XVIIe siècle (the 17th century, the “Grand Siècle” of Louis XIV and classical theatre), le XVIIIe siècle (the Enlightenment and the Revolution), le XIXe siècle (Romanticism, the Industrial Revolution, the Belle Époque), le XXe siècle (two World Wars, decolonisation, the Fifth Republic), le XXIe siècle (our current century). The Roman + e form is universally preferred over the Arabic-numeral alternative in academic and editorial French.
Republics and political bodies. France’s five republics: la Ire République (1792-1804, the First Republic), la IIe République (1848-1852), la IIIe République (1870-1940), la IVe République (1946-1958), la Ve République (1958-present). The Roman-numeral notation is the official designation. The IIIe Reich (the Third Reich, 1933-1945) follows the same convention in French historical writing about Germany.
Paris arrondissements. The 20 Paris arrondissements are referenced with Roman numerals plus superscript e in real-estate listings, restaurant guides, and editorial style: le Ier (Louvre), le Ve (Latin Quarter), le VIe (Saint-Germain), le XVIe (Auteuil-Passy), le XXe (Belleville). The numerical postal codes (75001 to 75020) are used for postal mail; the Roman ordinal form is used for editorial and conversational reference.
Books, plays, and academic structure. French academic and literary works typically number their major divisions with Roman numerals: chapitre I, chapitre II, chapitre III for chapters; partie I, partie II for major parts; livre I, livre II for books within a multi-volume work; tome I, tome II for separate volumes. Acts of plays use Roman numerals (Acte I, Acte II, Acte III, Acte IV, Acte V); scenes within an act use Arabic numerals (scène 1, scène 2). Hindi and Greek classics in French translation follow the same convention.
Frequently Asked Questions
When does French use Roman numerals?
For monarchs (Louis XIV, Henri IV, Napoléon III), popes (Jean-Paul II, Benoît XVI), centuries (le XXIe siècle = the 21st century), some congresses or political bodies (le IIIe Reich, la Ve République), book chapters and sections (chapitre III, section IV), Paris arrondissements (le Ve arrondissement = the 5th), and certain volume / edition / dynasty references. Modern French has not adopted Roman numerals as broadly as English has for clock faces (which use them stylistically) but uses them systematically for the historical/sequential contexts above.
How do you read "Louis XIV" in French?
Louis quatorze. The Roman numeral after a monarch's name is read as the corresponding cardinal number (not as an ordinal). Louis XIV = Louis quatorze (NOT Louis quatorzième), Henri IV = Henri quatre, Napoléon III = Napoléon trois, Charles X = Charles dix. The single exception is "premier" for the first: Louis I = Louis premier (NOT Louis un), François I = François premier.
How do you read "le XXIe siècle" in French?
Le vingt et unième siècle (the 21st century). When a Roman numeral is followed by the ordinal-superscript "e" (le XXe siècle, le XIXe siècle), it is read as an ordinal. The 20th century: le vingtième siècle. The 19th: le dix-neuvième siècle. The pattern: Roman + e = ordinal. Roman without the e (Louis XIV, Henri IV) = cardinal.
What is the rule for "premier" vs "première" in Roman-numeral context?
The 1st in any ordinal context is "premier" (masculine) or "première" (feminine). For monarchs: Louis Ier (Louis premier), Élisabeth Ire (Élisabeth première). For centuries: le Ier siècle (le premier siècle, the 1st century AD). For chapters: chapitre Ier (chapitre premier). The form premier / première is unique to the 1st position; from 2nd onwards the regular -ième suffix takes over (deuxième, troisième, etc.).
How are Roman numerals typed in French text?
In capital Roman letters: I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, etc. After a name, no separator: Louis XIV. After a noun in century/order context, the superscript "e" is added: le XXe siècle, le Ve arrondissement, la IIIe République. Some publications use lowercase Roman numerals for chapter sections and book parts (chapitre iii, partie ii). Both conventions are acceptable.
How do French Roman numerals differ from English usage?
The visual symbols are identical (I, V, X, L, C, D, M). The reading conventions differ slightly: French reads monarchs as cardinals (Louis quatorze, not Louis the fourteenth), while English typically reads them as ordinals (Louis the Fourteenth, the Fourteenth). French reads centuries as ordinals (le vingt et unième siècle), like English (the twenty-first century), but the Roman numeral notation is much more common in formal French writing than in English where Arabic numerals dominate.
Are there Roman numerals for very large numbers?
Yes, with overlines or other extensions, but they are rarely used in modern French. Standard Roman numerals top out at 3999 (MMMCMXCIX) without extension; for 4000 and above, an overline above a letter multiplies it by 1000. Modern French uses Arabic numerals for any number above the practical Roman ceiling. Roman numerals beyond MMM (3000) are essentially never seen in mainstream French publication.