What Happened in 43 BC
- Apr 14 Battle of Forum Gallorum: Mark Antony, besieging Julius Caesar's assassin Decimus Junius Brutus in Mutina, defeats the forces of the consul Pansa, who is killed.
- Apr 21 Battle of Mutina: Mark Antony is again defeated in battle by Aulus Hirtius, who is killed. Antony fails to capture Mutina and Decimus Brutus is murdered shortly after.
- Aug 19 Octavian, later known as Augustus, compels the Roman Senate to elect him Consul
- Nov 26 Second Triumvirate alliance of Roman leader Octavian (later Caesar Augustus), Marcus Aemilius Lepidus, and Mark Antony formed
- Dec 7 Marcus Tullius Cicero, Roman orator and politician is assassinated in Formiae