400 BC

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Millennium: 1st millennium BC
400 BC in various calendars
Gregorian calendar 400 BC
Ab urbe condita 354
Ancient Egypt era XXVIII dynasty, 5
- Pharaoh Amyrtaeus, 5
Ancient Greek era 95th Olympiad (victor
Assyrian calendar 4351
Balinese saka calendar N/A
Bengali calendar −992
Berber calendar 551
Buddhist calendar 145
Burmese calendar −1037
Byzantine calendar 5109–5110
Chinese calendar 庚辰(Metal Dragon)
2297 or 2237
    — to —
辛巳年 (Metal Snake)
2298 or 2238
Coptic calendar −683 – −682
Discordian calendar 767
Ethiopian calendar −407 – −406
Hebrew calendar 3361–3362
Hindu calendars
 - Vikram Samvat −343 – −342
 - Shaka Samvat N/A
 - Kali Yuga 2701–2702
Holocene calendar 9601
Iranian calendar 1021 BP – 1020 BP
Islamic calendar 1052 BH – 1051 BH
Javanese calendar N/A
Julian calendar N/A
Korean calendar 1934
Minguo calendar 2311 before ROC
Nanakshahi calendar −1867
Thai solar calendar 143–144
Tibetan calendar 阳金龙年
(male Iron-Dragon)
−273 or −654 or −1426
    — to —
(female Iron-Snake)
−272 or −653 or −1425
Celtic influence in Europe 400 BC (blue and purple).

Year 400 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Esquilinus, Capitolinus, Vulso, Medullinus, Saccus and Vulscus (or, less frequently, year 354 Ab urbe condita). The denomination 400 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]

  • Artaxerxes II King of Persia appoints Tissaphernes to take over all the districts in Asia Minor over which Artaxerxes II's brother Cyrus had been governor before his revolt.
  • Xenophon's "Ten Thousand" make their way back to Greece, with most of the men enlisting with the Spartans. Xenophon's successful march through the Persian Empire encourages Sparta to turn on the Persians and begin wars against the Persians in Asia Minor.
  • With the outbreak of the war between Sparta and the Persians, the Athenian admiral, Conon, obtains joint command, with Pharnabazus, of a Persian fleet.
  • War breaks out between Sparta and Elis.
  • The Carthaginians occupy Malta.
  • London has its origins on a rise above marshy waters at the point where the Walbrook joins the River Thames. The Celtic king, Belin, rebuilds an earth wall surrounding a few dozen huts and orders a small landing place to be cut into the south side of the wall, along the river front, where a wooden quay is built (approximate date)
  • Amyrtaeus of Sais successfully completes a revolt against Persian control by gaining control of all of Upper Egypt.
  • The Olmec culture in Mesoamerica comes to an end as its city of La Venta is abandoned (approximate date).
  • San Lorenzo Tenochtitlán is abandoned (approximate date).

By topic[edit]