Centuries: 4th century BC - 3rd century BC - 2nd century BC

Decades: 300s BC 290s BC 280s BC 270s BC 260s BC - 250s BC - 240s BC 230s BC 220s BC 210s BC 200s BC

Years: 257 BC 256 BC 255 BC 254 BC 253 BC - 252 BC - 251 BC 250 BC 249 BC 248 BC 247 BC

Births

Deaths

• Tidas , tyrant of Sicyon assassinated.

Events

• Annam (a kingdom in central Vietnam): Thuc dynasty replaces Hong-ban-thi dynasty