3rd Century BC
- 298 BC : Third Samnite War begins
- 298 BC : Rome captures Samnite cities Taurasia, Bovianum Vetus and Aufidena.
- 297 BC : Consul Fabius Maximus Rullianus defeats the Samnites near Tifernum (Liv. 10.14).
- 295 BC : Battle of Sentinum.
- 294 BC : Samnite victory at Luceria.
- 293 BC : Battle of Aquilonia.
- 291 BC : The Romans storm the Samnite city of Venusia.
- 290 BC : Rome dominates Italian Peninsula : Third Samnite War ends.
- 287 BC
- Last Plebeian Secession
- Lex Hortensia ends Senate veto power over Plebeian Council
- Conflict of the Orders ends.
- 283 BC : Rome defeats the Etruscans and the Boii (a Gallic tribe) in the Battle of Lake Vadimo
- 281 BC : Mounting tensions between Rome and Tarentum. Tarentum appeals to Pyrrhus of Epirus for aid.
- 280 BC
- Pyrrhic War begins
- Pyrrhus lands army in Italy
- 280 BC : Battle of Heraclea
- 279 BC : Battle of Asculum
- 275 BC : Battle of Beneventum
- 272 BC
- Pyrrhus withdraws to Epirus
- Tarentum surrenders to Rome
- Pyrrhic War Ends
- Pyrrhic War begins
- 267 BC : Number of quaestors raised from 4 to 6
- 264/241 BC : Conquest of Sicily, First Punic War against Carthage
- 242 BC : Office of Praetor peregrinus created
- 241 BC : Sicily becomes the first Roman province : First Punic War Ends
- 238 BC : Sardinia and Corsica become Roman Provinces in the "Truceless War" with Carthage
- 229 BC : Adriatic Control : First Illyrian War begins.
- 227 BC
- Queen Teuta surrenders : First Illyrian War ends
- Number of quaestors raised from 6 to 8
- number of praetors raised from 2 to 4
- 224 BC : Rome defeats Gaul invasion : Battle of Telamon
- 222 BC : Rome defeats Gauls : Cisalpine Gaul
- 220 BC : Adriatic Control : Second Illyrian War begins.
- 219 BC : Demetrius defeated : Second Illyrian War ends.
- 218/201 BC : Conquest Western Mediterranean : Second Punic War against Carthage. Rome is defeated at the Battle of the River Trebia.
- 216 BC : Hannibal defeats Roman forces : Battle of Cannae
- 214/205 BC : Stalemate : First Macedonian War
- 213/211 BC : Rome captures Syracuse : Siege of Syracuse
- 204/202 BC : Scipio Africanus Major invades Africa, Hannibal recalled and defeated : Battle of Zama
- 202/196 BC : Philip V of Macedon defeated : Second Macedonian War
Read more about this topic: Timeline Of Ancient Rome