222 BC

Events
By place
Greece
 Cleomenes III is defeated and the Spartan army annihilated by the Achaean League and the Macedonians in the Battle of Sellasia.
 Ptolemy IV succeeds his father Ptolemy III as king of Egypt.

Rome
 Marcus Claudius Marcellus leads the Romans to victory in the Battle of Clastidium, conquering the area later known as Cisalpine Gaul.
The Romans capture Milan.

Asia
 State of Qin conquers the state of Yan and defeats the last defensive forces of the state of Zhao in China .

 Deaths 

 Ptolemy III Euergeter I, king of Egypt
 Ctesibius, mathematician

Category:222 BC