Centuries in Roman Numerals

Century ordinals written as Roman numerals—plus clear examples that separate year 20, the 20th century, and the numeral XX.

Do not confuse these three

Year 20 → XX (the year itself)
20th century → years 1901–2000 → century numeral XX
XX as a bare numeral can mean 20 depending on context—always label whether you mean a year or a century ordinal

Examples: 19th century = XIX · 20th century = XX · 21st century = XXI

1st through 40th centuries
Century	Roman	Year span	Example year
1st	I	1–100	26 · XXVI
2nd	II	101–200	126 · CXXVI
3rd	III	201–300	226 · CCXXVI
4th	IV	301–400	326 · CCCXXVI
5th	V	401–500	426 · CDXXVI
6th	VI	501–600	526 · DXXVI
7th	VII	601–700	626 · DCXXVI
8th	VIII	701–800	726 · DCCXXVI
9th	IX	801–900	826 · DCCCXXVI
10th	X	901–1000	926 · CMXXVI
11th	XI	1001–1100	1026 · MXXVI
12th	XII	1101–1200	1126 · MCXXVI
13th	XIII	1201–1300	1226 · MCCXXVI
14th	XIV	1301–1400	1326 · MCCCXXVI
15th	XV	1401–1500	1426 · MCDXXVI
16th	XVI	1501–1600	1526 · MDXXVI
17th	XVII	1601–1700	1626 · MDCXXVI
18th	XVIII	1701–1800	1726 · MDCCXXVI
19th	XIX	1801–1900	1826 · MDCCCXXVI
20th	XX	1901–2000	1926 · MCMXXVI
21st	XXI	2001–2100	2026 · MMXXVI
22nd	XXII	2101–2200	2126 · MMCXXVI
23rd	XXIII	2201–2300	2226 · MMCCXXVI
24th	XXIV	2301–2400	2326 · MMCCCXXVI
25th	XXV	2401–2500	2426 · MMCDXXVI
26th	XXVI	2501–2600	2526 · MMDXXVI
27th	XXVII	2601–2700	2626 · MMDCXXVI
28th	XXVIII	2701–2800	2726 · MMDCCXXVI
29th	XXIX	2801–2900	2826 · MMDCCCXXVI
30th	XXX	2901–3000	2926 · MMCMXXVI
31st	XXXI	3001–3100	3026 · MMMXXVI
32nd	XXXII	3101–3200	3126 · MMMCXXVI
33rd	XXXIII	3201–3300	3226 · MMMCCXXVI
34th	XXXIV	3301–3400	3326 · MMMCCCXXVI
35th	XXXV	3401–3500	3426 · MMMCDXXVI
36th	XXXVI	3501–3600	3526 · MMMDXXVI
37th	XXXVII	3601–3700	3626 · MMMDCXXVI
38th	XXXVIII	3701–3800	3726 · MMMDCCXXVI
39th	XXXIX	3801–3900	3826 · MMMDCCCXXVI
40th	XL	3901–3999	3926 · MMMCMXXVI