222 BCE
The Qin generals Wang Ben and Li Xin conquer Liaodong, thereby completing the subjugation of Yan. Battle of Sellasia: Cleomenes III of Sparta is defeated by Antigonus III of Macedon and his allies (the Achaean League, the Boeotian League, the Acarnanians, Epirus and the Illyrians under the command of Demetrius of Pharos) near Sellasia (north of Sparta) and flees to Egypt under the protection of King Ptolemy III. Antigonus III's forces occupy Sparta, which is the first time this city has ever been occupied. Mithridates II of Pontus gives his daughter Laodice in marriage to the Seleucid king Antiochus III. Another of his daughters, also named Laodice, is married about the same time to general Achaeus.
Geopolitics & Diplomacy
- After taking Acerrae Gnaeus Cornelius Scipio Calvus marches on Mediolanum (modern Milan), another stronghold of the Insubres, which also falls into Roman hands, upon which the chieftains of the Insubres lose all hope and surrendered unconditionally. Thus the Romans succeeded in conquering the largest independent Celtic tribe in Italy and firmly established their hegemony over the Po Valley, then the most productive agricultural region in the peninsula.source
- Almost all of Greece falls under Macedonian suzerainty after Antigonus III re-establishes the Hellenic Alliance as a confederacy of leagues, with himself as president.source
Conflict & Security
- The Romans split their forces. Marcus Claudius Marcellus heads for Clastidium while his colleague Gnaeus Cornelius Scipio Calvus continues the siege of Acerrae. At the Battle of Clastidium Marcellus defeats the Gaesatae. Marcellus personally slays Viridomarus. This victory removes the Gallic threat to Rome. Marcellus is awarded the spolia opima for the third and last time in Roman history.source
- The Qin generals Wang Ben and Li Xin conquer Liaodong, thereby completing the subjugation of Yan.source
- Wang Ben conquers Dai, thereby completing the subjugation of Zhao.source
- Seleucid forces under their general Achaeus succeed in winning back all the Seleucid domains in Asia Minor (lost six years earlier to Pergamum).source
- Battle of Sellasia: Cleomenes III of Sparta is defeated by Antigonus III of Macedon and his allies (the Achaean League, the Boeotian League, the Acarnanians, Epirus and the Illyrians under the command of Demetrius of Pharos) near Sellasia (north of Sparta) and flees to Egypt under the protection of King Ptolemy III. Antigonus III's forces occupy Sparta, which is the first time this city has ever been occupied.source
- The Qin general Wang Jian conquers Wuyue, forcing the capitulation of its ruler. The conquered region becomes the province of Kuaiji. This campaign completes the subjugation of the lands formerly held by the State of Chu, and it also serves as a precursor for the Qin campaign against the Yue tribes.source
Culture & Society
- Mithridates II of Pontus gives his daughter Laodice in marriage to the Seleucid king Antiochus III. Another of his daughters, also named Laodice, is married about the same time to general Achaeus.source