Caracalla grants citizenship to all
Every free inhabitant of the empire becomes a Roman citizen

In 212 Caracalla granted Roman citizenship to almost all free inhabitants of the empire. The historian Cassius Dio thought the emperor simply wanted more tax, since only citizens paid the inheritance tax.
Wikipedia (Russian) · Wikipedia (English) · 3rd century
Meanwhile around the world (±25 years)
Middle East
- c. 200 Compilation of the Mishnah — 12 years earlier
- 224 Rise of the Sasanian Empire — 12 years later
Asia
- 208 Battle of Red Cliffs — 4 years earlier
- 220 Fall of the Han and the Three Kingdoms — 8 years later
Americas
- c. 200 Pyramid of the Sun at Teotihuacan — 12 years earlier
Oceania
- c. 232 Hatepe eruption of Taupō — 20 years later
Alive at the time
- Galen (aged 83)
- Nagarjuna (aged 62)
- Cao Cao (aged 57)
- Zhuge Liang (aged 31)
- Plotinus (aged 8)