Centuries: 6th century BC - 5th century BC - 4th century BC

Decades: 470s BC 460s BC 450s BC 440s BC 430s BC - 420s BC - 410s BC 400s BC 390s BC 380s BC 370s BC

Years: 425 BC 424 BC 423 BC 422 BC 421 BC - 420 BC - 419 BC 418 BC 417 BC 416 BC 415 BC

Events

• Athens, Argus, Mantinea and Elis ally against Sparta

Births

Deaths

• Herodotus, Greek historian (approximate year)
• Protagoras

420s BC

420 aC | 420 f.Kr. | 420 adC | -420 | 기원전 420년 | 420 p.n.e. | 420 aK | 420 a.C. | -420 | 420 SM | 420 v. Chr. | 420 AC | -420 | 420 p.n.e. | 420 a.C. | 420 до н. э. | 420 pr. n. št. | 420. пне. | 420 eaa | 420 f.Kr. | 前420年