Year 451 (CDLI) was a common year starting on Monday (link will display the full calendar) 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.

Millennium: 1st millennium
451 in various calendars
Gregorian calendar451
Ab urbe condita1204
Assyrian calendar5201
Balinese saka calendar372–373
Bengali calendar−142
Berber calendar1401
Buddhist calendar995
Burmese calendar−187
Byzantine calendar5959–5960
Chinese calendar庚寅年 (Metal Tiger)
3147 or 3087
    — to —
辛卯年 (Metal Rabbit)
3148 or 3088
Coptic calendar167–168
Discordian calendar1617
Ethiopian calendar443–444
Hebrew calendar4211–4212
Hindu calendars
 - Vikram Samvat507–508
 - Shaka Samvat372–373
 - Kali Yuga3551–3552
Holocene calendar10451
Iranian calendar171 BP – 170 BP
Islamic calendar176 BH – 175 BH
Javanese calendar336–337
Julian calendar451
Korean calendar2784
Minguo calendar1461 before ROC
Nanakshahi calendar−1017
Seleucid era762/763 AG
Thai solar calendar993–994
Tibetan calendar阳金虎年
(male Iron-Tiger)
577 or 196 or −576
    — to —
(female Iron-Rabbit)
578 or 197 or −575
Invasion of Attila the Hun in Gaul (451)

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