|Millennium:||1st millennium BC|
|Centuries:||4th century BC – 3rd century BC – 2nd century BC|
|Decades:||250s BC 240s BC 230s BC – 220s BC – 210s BC 200s BC 190s BC|
|Years:||226 BC 225 BC 224 BC – 223 BC – 222 BC 221 BC 220 BC|
|223 BC by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Gregorian calendar||223 BC
|Ab urbe condita||531|
|English Regnal year||N/A|
— to —戊寅年
|- Vikram Samvat||-166–-165|
|- Shaka Samvat||N/A|
|- Kali Yuga||2879–2880|
|- Ǹrí Ìgbò||-1222–-1221|
|Iranian calendar||844 BP – 843 BP|
|Islamic calendar||870 BH – 869 BH|
|Juche calendar||N/A (before 1912)|
|Minguo calendar||2134 before ROC
|Thai solar calendar||321|
|Wikimedia Commons has media related to: 223 BC|
Year 223 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Flaminus and Philus (or, less frequently, year 531 Ab urbe condita). The denomination 223 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.
- The Seleucid king Seleucus III is assassinated in Phrygia by members of his army while on campaign against Attalus of Pergamon.
- Seleucus is succeeded by his younger brother, Antiochus III. From the previous administration, Antiochus III retains Hermeias as his chief minister, Achaeus as governor of Anatolia, and Molon and his brother Alexander as governors of the eastern provinces of Media and Persis.
- Gaius Flaminius Nepos is elected consul for the first time, and with Publius Furius Philus he forces the Cisalpine Gauls to submit to Rome, creating the province of Cisalpine Gaul.
- The Spartan king Cleomenes III destroys and burns the city of Megalopolis but the inhabitants are saved by Philopoemen who leads the defence of the city until the inhabitants can escape.
- The king of Macedonia, Antigonus III Doson, restores Macedonian influence in the Peloponnese for the first time in almost two decades. After signing alliances with the Achaeans, Boeotians, Thessalians and the Acarnanians, Antigonus invades the Peloponnese and drives the Spartans out of Argos, taking Orchomenus and Mantineia in the process.
- King Diodotus II of Bactria is killed by an usurper, Euthydemus I, founder of the Greco-Bactrian Euthydemid dynasty.
- Seleucus III, king of the Seleucid dynasty from 226 BC (assassinated) (b. c. 243 BC)
- Diodotus II, King of Bactria, the son and successor of Diodotus I (approximate date) (b. c. 252 BC)
- Lord Changping, the last king of Chu, one of the Seven Warring States in ancient China.
- Xiang Yan, the last general of Chu and the grandfather of Xiang Yu, the Hegemon-King of Western Chu.
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