Decades: 310s BC 300s BC 290s BC 280s BC 270s BC - **260s BC** - 250s BC 240s BC 230s BC 220s BC 210s BC

Years: 270 BC 269 BC 268 BC 267 BC 266 BC - **265 BC** - 264 BC 263 BC 262 BC 261 BC 260 BC

- Archimedes, Greek mathematician, develops screw, specific gravity
- Velzna, the last Etruscan city subdued by the Romans
- Acrotatus succeeds his father Areus I as king of Sparta

- Apollonius of Perga, mathematician