Back 451 Abkhazian 451 Afrikaans 451 ALS 451 እ.ኤ.አ. Amharic 451 AN 451 Arabic 451 AST 451 Azerbaijani ۴۵۱ (میلادی) AZB 451 Byelorussian
| Millennium: | 1st millennium |
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| Centuries: | |
| Decades: | |
| Years: | |
 | This article needs additional citations for verification. (February 2024) |
| 451 by topic |
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| Leaders |
| Categories |
| Gregorian calendar | 451 CDLI |
| Ab urbe condita | 1204 |
| Assyrian calendar | 5201 |
| Balinese saka calendar | 372–373 |
| Bengali calendar | −143 – −142 |
| Berber calendar | 1401 |
| Buddhist calendar | 995 |
| Burmese calendar | −187 |
| Byzantine calendar | 5959–5960 |
| Chinese calendar | 庚寅年 (Metal Tiger) 3148 or 2941 — to — 辛卯年 (Metal Rabbit) 3149 or 2942 |
| Coptic calendar | 167–168 |
| Discordian calendar | 1617 |
| Ethiopian calendar | 443–444 |
| Hebrew calendar | 4211–4212 |
| Hindu calendars | |
| - Vikram Samvat | 507–508 |
| - Shaka Samvat | 372–373 |
| - Kali Yuga | 3551–3552 |
| Holocene calendar | 10451 |
| Iranian calendar | 171 BP – 170 BP |
| Islamic calendar | 176 BH – 175 BH |
| Javanese calendar | 336–337 |
| Julian calendar | 451 CDLI |
| Korean calendar | 2784 |
| Minguo calendar | 1461 before ROC 民前1461年 |
| Nanakshahi calendar | −1017 |
| Seleucid era | 762/763 AG |
| Thai solar calendar | 993–994 |
| Tibetan calendar | 阳金虎年 (male Iron-Tiger) 577 or 196 or −576 — to — 阴金兔年 (female Iron-Rabbit) 578 or 197 or −575 |
Year 451 (CDLI) was a common year starting on Monday of the Julian calendar. At the time, it was known as the Year of the Consulship of Marcianus and Adelfius (or, less frequently, year 1204 Ab urbe condita). The denomination 451 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.