203
| Years: 199 200 201 202 – 203 – 204 205 206 207 | |
| Decades: 170s 180s 190s – 200s – 210s 220s 230s | |
| Centuries: 2nd century – 3rd century – 4th century | |
Events
- Roman Emperor Septimius Severus rebuilds Byzantium.
Births
- Probable birth of Roman Emperor Marcus Aurelius Antoninus, better known as Heliogabalus
- Cao Rui, emperor of the Kingdom of Wei (approximate date).
Deaths
Categories: 203