421 BC

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Millennium: 1st millennium BC
Centuries: 6th century BC5th century BC4th century BC
Decades: 450s BC  440s BC  430s BC  – 420s BC –  410s BC  400s BC  390s BC
Years: 424 BC 423 BC 422 BC421 BC420 BC 419 BC 418 BC
421 BC in other calendars
Gregorian calendar 421 BC
Ab urbe condita 333
Ancient Egypt era XXVII dynasty, 105
- Pharaoh Darius II of Persia, 3
Ancient Greek era 89th Olympiad, year 4
Assyrian calendar 4330
Bengali calendar −1013
Berber calendar 530
Buddhist calendar 124
Burmese calendar −1058
Byzantine calendar 5088–5089
Chinese calendar 己未(Earth Goat)
2276 or 2216
    — to —
庚申年 (Metal Monkey)
2277 or 2217
Coptic calendar −704 – −703
Discordian calendar 746
Ethiopian calendar −428 – −427
Hebrew calendar 3340–3341
Hindu calendars
 - Vikram Samvat −364 – −363
 - Shaka Samvat N/A
 - Kali Yuga 2681–2682
Holocene calendar 9580
Iranian calendar 1042 BP – 1041 BP
Islamic calendar 1074 BH – 1073 BH
Julian calendar N/A
Korean calendar 1913
Minguo calendar 2332 before ROC
Thai solar calendar 122–123

Year 421 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Vibulanus and Barbatus (or, less frequently, year 333 Ab urbe condita). The denomination 421 BC 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.


By place[edit]


  • Nicias, the leader of the aristocratic and peace party in Athens and Pleistoanax, King of Sparta, negotiate the Peace of Nicias between Athens and Sparta, which brings a temporary end to the Peloponnesian War. The essence of the Peace of Nicias is a return to the prewar situation: most wartime gains are to be returned. Seventeen representatives from each side swear an oath to uphold the treaty, which is meant to last for thirty years or one generation (meaning they are not responsible for the next generation's decision). All of Sparta's allies agree to sign the peace, except for the Boeotians, Corinth, Elis, and Megara.
  • Alcibiades engineers an anti-Spartan alliance between Athens and the democracies of Argos, Mantinea and Elis.


By topic[edit]