427 BC

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Millennium: 1st millennium BC
427 BC in various calendars
Gregorian calendar427 BC
Ab urbe condita327
Ancient Egypt eraXXVII dynasty, 99
- PharaohArtaxerxes I of Persia, 39
Ancient Greek era88th Olympiad, year 2
Assyrian calendar4324
Balinese saka calendarN/A
Bengali calendar−1019
Berber calendar524
Buddhist calendar118
Burmese calendar−1064
Byzantine calendar5082–5083
Chinese calendar癸丑年 (Water Ox)
2271 or 2064
    — to —
甲寅年 (Wood Tiger)
2272 or 2065
Coptic calendar−710 – −709
Discordian calendar740
Ethiopian calendar−434 – −433
Hebrew calendar3334–3335
Hindu calendars
 - Vikram Samvat−370 – −369
 - Shaka SamvatN/A
 - Kali Yuga2674–2675
Holocene calendar9574
Iranian calendar1048 BP – 1047 BP
Islamic calendar1080 BH – 1079 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1907
Minguo calendar2338 before ROC
Nanakshahi calendar−1894
Thai solar calendar116–117
Tibetan calendar阴水牛年
(female Water-Ox)
−300 or −681 or −1453
    — to —
(male Wood-Tiger)
−299 or −680 or −1452

Year 427 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Ahala and Mugillanus (or, less frequently, year 327 Ab urbe condita). The denomination 427 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]


  • Sparta's King Archidamus II is succeeded by his son Agis II.
  • Following the surrender of Mytilene to Athens, the Athenian leader Cleon insists that the city be destroyed. In response to the pleadings of a number of Athenian citizens, Cleon's decree to destroy the population of Mytilene is reversed with only the ringleaders of the Mytilenean revolt being executed.
  • Plataea surrenders to the Spartans and Thebans after its garrison comes close to death from starvation. Over 200 prisoners are put to death and Plataea is destroyed.
  • The civil war in Corcyra, in which the Athenians and the Spartans have interfered ineffectually, results in a victory of the democrats (who support an alliance with Athens) over the oligarchs.
  • In an effort to blockade Sparta from access to Sicilian corn, Athens responds to a plea for help from a delegation from the city of Leontini led by Gorgias, the sophist and rhetorician. Leontini is being threatened by Syracuse which is allied to Sparta. However, the Athenian mission led by the Athenian general Laches is unable to offer much help. Laches is later prosecuted by Cleon for his unsuccessful mission to support Athenian interests in Sicily.

Roman Republic[edit]