|Millennium:||1st millennium BC|
|291 BC by topic|
Year 291 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Megellus and Brutus (or, less frequently, year 463 Ab urbe condita). The denomination 291 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Demetrius Poliorcetes joins his son, Antigonus, in the siege of Thebes. As the Thebans defend their city stubbornly, Demetrius forces his men to attack the city at great cost. Demetrius finally takes the city after using siege engines to demolish its walls.
- Menander, Athenian dramatist, considered to be a master of Greek New Comedy (b. c. 342 BC)
- Dinarchus, Athenian speech writer whose work is generally thought to reflect the gradual decline of Attic oratory (b. c. 361 BC)