Centuries: 3rd century - 4th century - 5th century

Decades: 250s 260s 270s 280s 290s - 300s - 310s 320s 330s 340s 350s

Years: 300 301 302 303 304 - 305 - 306 307 308 309 310

• May 1 - Diocletian and Maximian, emperors of Rome, retire from office.
• Constantius Chlorus and Galerius declared Augusti; Flavius Valerius Severus and Maximinus Daia appointed Caesars.
• The Arch of Galerius is built.

Deaths