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423 in various calendars
Gregorian calendar	423; CDXXIII
Ab urbe condita	1176
Assyrian calendar	5173
Balinese saka calendar	344–345
Bengali calendar	−171 – −170
Berber calendar	1373
Buddhist calendar	967
Burmese calendar	−215
Byzantine calendar	5931–5932
Chinese calendar	壬戌年 (Water Dog); 3120 or 2913; — to —; 癸亥年 (Water Pig); 3121 or 2914
Coptic calendar	139–140
Discordian calendar	1589
Ethiopian calendar	415–416
Hebrew calendar	4183–4184
Hindu calendars
- Vikram Samvat	479–480
- Shaka Samvat	344–345
- Kali Yuga	3523–3524
Holocene calendar	10423
Iranian calendar	199 BP – 198 BP
Islamic calendar	205 BH – 204 BH
Javanese calendar	307–308
Julian calendar	423; CDXXIII
Korean calendar	2756
Minguo calendar	1489 before ROC; 民前1489年
Nanakshahi calendar	−1045
Seleucid era	734/735 AG
Thai solar calendar	965–966
Tibetan calendar	阳水狗年; (male Water-Dog); 549 or 168 or −604; — to —; 阴水猪年; (female Water-Pig); 550 or 169 or −603

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

Year 423 (CDXXIII) was a common year starting on Monday of the Julian calendar. At the time, it was known in Rome as the Year of the Consulship of Marinianus and Asclepiodotus (or, less frequently, year 1176 Ab urbe condita). The denomination 423 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

August 15 – Emperor Honorius, age 38, dies at Ravenna of dropsy, perhaps pulmonary edema. With no children to claim the throne, Joannes, primicerius notariorum ("chief notary", head of the civil service), seizes the throne of the Western Roman Empire, and is declared emperor. Among his supporters are Flavius Aetius, Roman general (magister militum). Joannes' rule is accepted in the dioceses of Gaul, Hispania and Italia, but not in Africa.^[1]
Winter – Emperor Theodosius II refuses to recognize Joannes as emperor, and prepares for war. He mobilizes an expeditionary force under command of Ardaburius, and his son Flavius Aspar.