200 BCCenturies: 3rd century BC - 2nd century BC - 1st century BC
- Rome declares war upon Philip, king of Macedon.
- Roman forces defeat the Gauls of Cisalpine Gaul at Cremona
- Hannibal becomes Chief Magistrate of Carthage.
- The Bacchanalia are introduced in the Roman Empire. (approximate date)
- City of Tiwanaku founded near Lake Titicaca, in what is now modern Bolivia.
- Second Macedonian War begins
- Diophantus, Greek mathematician (approximate date of birth)