Decades: 270s BC 260s BC 250s BC 240s BC 230s BC - **220s BC** - 210s BC 200s BC 190s BC 180s BC 170s BC

Years: 227 BC 226 BC 225 BC 224 BC 223 BC - **222 BC** - 221 BC 220 BC 219 BC 218 BC 217 BC

- Marcus Claudius Marcellus leads the Romans to victory in the Battle of Clastidium, conquering the area later known as Cisalpine Gaul.
- Cleomenes III defeated and the Spartan army annihilated by Achaeus, general of Antiochus III the Great in the Battle of Sellasia.
- Ptolemy IV succeeds his father Ptolemy III as king of Egypt.
- State of Qin conquered the state of Yan and defeated the last defensive forces of the state of Zhao in China .

- Ptolemy III Euergeter I, king of Egypt
- Ktisibios