Editing 3rd century BC (section)

===[[220s BC]]===
*[[229 BC]]: The [[First Illyrian War]] ends with a Roman victory.
*229 BC: Last tyrants on the [[Peloponnese]] abdicate, [[Argos, Peloponnese|Argos]] joins the Achaean League, [[Athens]] liberated from Macedonian garrison.
*[[227 BC]]: The attempted assassination of [[Ying Zheng]] (嬴政), king of [[State of Qin|Qin State]], by [[Jing Ke]] (荊軻) from [[State of Yan|Yan]] failed.
*[[225 BC]]: A large Gallic army is defeated by the Romans at the [[Battle of Telamon]].
*[[225 BC]]: The Chinese [[State of Qin|Qin State]] conquers [[State of Wei|Wei]].
*[[223 BC]]: The Chinese [[State of Qin|Qin State]] conquers [[State of Chu|Chu]].
*[[222 BC]]: The Chinese [[State of Qin|Qin State]] conquers [[State of Yan|Yan]] and [[State of Zhao|Zhao]].
*222 BC: Spartan defeat in the [[Battle of Sellasia]] ends the [[Cleomenean War]].
*[[221 BC]]: With the conquest of the [[Qi (state)|State of Qi]], [[Qin Shi Huang]] (秦始皇) [[Qin's wars of unification|unifies the whole of China]] into one empire that also included northern Vietnam, forming the [[Qin dynasty]].
*[[220 BC]]: the [[Social War (220–217 BC)]] of Greece begins, pitting [[Macedonia (ancient kingdom)|Macedonia]] and the [[Achaean League]] against [[Sparta]] and the [[Aetolian League]], ultimately resulting in a Macedonian-Achaean victory with territorial gains for each.