400 BC
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| 400 BC by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| 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 |
[edit] Events
[edit] By place
[edit] Persian Empire
- 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.
[edit] Greece
- 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.
[edit] Carthage
- The Carthaginians occupy Malta.
[edit] Britain
- 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).
[edit] Egypt
- Amyrtaeus of Sais successfully completes a revolt against Persian control by gaining control of all of Upper Egypt.
[edit] By topic
[edit] Arts & sciences
- 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).
[edit] Religion
- Brahmanism starts evolving in Hinduism, a process which takes place over the following 200 years (approximate date).

