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Millennium:	1st millennium BC
Centuries:	6th century BC 5th century BC 4th century BC
Decades:	440s BC 430s BC 420s BC 410s BC 400s BC
Years:	426 BC 425 BC 424 BC 423 BC 422 BC 421 BC 420 BC

Politics
423 BC by topic
State leaders Political entities
Categories
Deaths
v t e

423 BC in various calendars
Gregorian calendar	423 BC CDXXIII BC
Ab urbe condita	331
Ancient Egypt era	XXVII dynasty, 103
- Pharaoh	Darius II of Persia, 1
Ancient Greek era	89th Olympiad, year 2
Assyrian calendar	4328
Balinese saka calendar	N/A
Bengali calendar	−1015
Berber calendar	528
Buddhist calendar	122
Burmese calendar	−1060
Byzantine calendar	5086–5087
Chinese calendar	丁巳年 (Fire Snake) 2275 or 2068 — to — 戊午年 (Earth Horse) 2276 or 2069
Coptic calendar	−706 – −705
Discordian calendar	744
Ethiopian calendar	−430 – −429
Hebrew calendar	3338–3339
Hindu calendars
- Vikram Samvat	−366 – −365
- Shaka Samvat	N/A
- Kali Yuga	2678–2679
Holocene calendar	9578
Iranian calendar	1044 BP – 1043 BP
Islamic calendar	1076 BH – 1075 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	1911
Minguo calendar	2334 before ROC 民前2334年
Nanakshahi calendar	−1890
Thai solar calendar	120–121
Tibetan calendar	阴火蛇年 (female Fire-Snake) −296 or −677 or −1449 — to — 阳土马年 (male Earth-Horse) −295 or −676 or −1448

Year 423 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Atratinus and Ambustus (or, less frequently, year 331 Ab urbe condita). The denomination 423 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.

Events

By place

Persian empire

Ochus, satrap of Hyrcania and son of Artaxerxes I and a Babylonian concubine, seizes the Persian throne from his half brother Secydianus (or Sogdianus), whom he has executed. The new king rules as Darius II.

Greece

The Athenian general, Laches, successfully moves in the Athenian Assembly for an armistice with Sparta to check the progress of Sparta's most effective general, Brasidas. However, the "Truce of Laches" has little impact on Brasidas and collapses within a year.
Brasidas ignores the proposed year-long truce and proceeds to take Scione and Mende in the hope of reaching Athens and freeing Spartan prisoners. Athens sends reinforcements under Nicias who retakes Mende.

Rome

Gaius Sempronius Atratinus and Quintus Fabius Vibulanus are elected as consuls^[1]
Sextus Tempanius, Aulus Sellius, Sextus Antistius, and Spurius Icilius are chosen by the commons as tribunes^[2]

By topic

Drama

Aristophanes' play The Clouds is performed^[3] as is Sophocles' play Maidens of Trachi and The Putine (The Bottle), by Cratinus.