403 BC

Centuries:	6th century BC - 5th century BC - 4th century BC
Decades:	430s BC 420s BC 410s BC - 400s BC - 390s BC 380s BC 370s BC
Years:	406 BC 405 BC 404 BC - 403 BC - 402 BC 401 BC 400 BC

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

**403 BC in other calendars**
Gregorian calendar	403 BC
Ab urbe condita	351
Armenian calendar	N/A
Bahá'í calendar	-2246 – -2245
Berber calendar	548
Buddhist calendar	142
Burmese calendar	-1040
Chinese calendar	2234/2294 ([[Sexagenary cycle\|]]年) — to — 2235/2295 ([[Sexagenary cycle\|]]年)
Coptic calendar	-686 – -685
Ethiopian calendar	-410 – -409
Hebrew calendar	3358 – 3359
Hindu calendars
- Vikram Samvat	-347 – -346
- Shaka Samvat	N/A
- Kali Yuga	2699 – 2700
Holocene calendar	9598
Iranian calendar	1024 BP – 1023 BP
Islamic calendar	1055 BH – 1054 BH
Japanese calendar
- Imperial Year	Kōki 258 (皇紀258年)
Korean calendar	1931
Thai solar calendar	141
v • d • e

Events

Thrasybulus leads the democratic resistance to the new oligarchic government, known as the Thirty Tyrants, that the victorious Spartans have imposed on Athens. He commands a small force of exiles that invades Attica and, in successive battles, defeats first a Spartan garrison and then the forces of the oligarchic government (which includes the Spartan general, Lysander) in the Battle of Munychia. The leader of the Thirty Tyrants, Critias, is killed in the battle.
The Battle of Piraeus is fought between Athenian exiles, who have defeated the government of the Thirty Tyrants and occupied Piraeus, and a Spartan force sent to combat them. In the battle, the Spartans narrowly defeat the exiles, with both sides suffering large numbers of casualties. After the battle, the Agiad King of Sparta, Pausanias arranges a settlement between the two parties which allows the reunification of Athens and Piraeus, and the re-establishment of democratic government in Athens. The remaining oligarchic Thirty Tyrants are allowed to flee to Eleusis.
Thrasybulus restores democratic institutions to Athens and grants amnesties to all except the oligarchic extremists. He is helped by Lysias, the Athenian orator, in arguing the case against the oligarchy.
Andocides, Athenian orator and politician, who has been implicated in the mutilation of the Herms on the eve of the departure of the Athenian expedition against Sicily in 415 BC, returns from exile under the general amnesty.

The state of Jin in China is partitioned among three elite landholding families. This is the beginning of the Warring States Period.
Marquis Wen of Wei ascends to power in the State of Wei. He sponsors Confucianism and employs able political advisors such as Li Kui, Wu Qi, and Ximen Bao.