423 BC

Millennium: 1st millennium BC
Centuries:
Decades:
Years:
423 BC in various calendars
Gregorian calendar423 BC
CDXXIII BC
Ab urbe condita331
Ancient Egypt eraXXVII dynasty, 103
- PharaohDarius II of Persia, 1
Ancient Greek era89th Olympiad, year 2
Assyrian calendar4328
Balinese saka calendarN/A
Bengali calendar−1015
Berber calendar528
Buddhist calendar122
Burmese calendar−1060
Byzantine calendar5086–5087
Chinese calendar丁巳年 (Fire Snake)
2275 or 2068
    — to —
戊午年 (Earth Horse)
2276 or 2069
Coptic calendar−706 – −705
Discordian calendar744
Ethiopian calendar−430 – −429
Hebrew calendar3338–3339
Hindu calendars
 - Vikram Samvat−366 – −365
 - Shaka SamvatN/A
 - Kali Yuga2678–2679
Holocene calendar9578
Iranian calendar1044 BP – 1043 BP
Islamic calendar1076 BH – 1075 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1911
Minguo calendar2334 before ROC
民前2334年
Nanakshahi calendar−1890
Thai solar calendar120–121
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.