222 BC

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:	225 BC 224 BC 223 BC – 222 BC – 221 BC 220 BC 219 BC

Events

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.

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.

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