400 BC: Information from Answers.com

Millennium:	1st millennium BC
Centuries:	5th century BC – 4th century BC – 3rd century BC
Decades:	430s BC 420s BC 410s BC – 400s BC – 390s BC 380s BC 370s BC
Years:	403 BC 402 BC 401 BC – 400 BC – 399 BC 398 BC 397 BC

400 BC by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments v • d • e

Celtic influence in Europe 400 BC (blue and purple).

**400 BC in other calendars**
Gregorian calendar	400 BC
Ab urbe condita	354
Armenian calendar	N/A
Bahá'í calendar	-2243 – -2242
Berber calendar	551
Buddhist calendar	145
Burmese calendar	-1037
Byzantine calendar	5109 – 5110
Chinese calendar	[[Sexagenary cycle\|]]年 (2237/2297) — to — [[Sexagenary cycle\|]]年 (2238/2298)
Coptic calendar	-683 – -682
Ethiopian calendar	-407 – -406
Hebrew calendar	3361 – 3362
Hindu calendars
- Vikram Samvat	-344 – -343
- Shaka Samvat	N/A
- Kali Yuga	2702 – 2703
Holocene calendar	9601
Iranian calendar	1021 BP – 1020 BP
Islamic calendar	1052 BH – 1051 BH
Japanese calendar
Korean calendar	1934
Thai solar calendar	144
v • d • e

Events

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.

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 catapult is invented by Greek engineers.
The Mature classical period of sculpture ends in Ancient Greece and is succeeded by the fourth-century (Late Classical) period (approximate date).
A model of the Acropolis of Athens is made. It is now kept at the Royal Ontario Museum in Toronto, Canada (approximate date).
Theodorus from Phokaia in Asia Minor, builds the Tholos, the sanctuary of Athena Pronaia in Delphi (approximate date).

Brahmanism starts evolving in Hinduism, a process which takes place over the following 200 years (approximate date).

Thucydides, Greek historian (approximate date) (b. c. 460 BC)
Aspasia of Miletus, widow of Pericles of Athens (approximate date) (b. c. 470 BC)

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