|Millennium:||1st millennium BC|
|77 BC by topic|
Year 77 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Brutus and Lepidus. Later and less frequently, it was known as the year 677 AUC). The denomination 77 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.
- Marcus Aemilius Lepidus, Roman consul and leader of the democratic party, is defeated by Quintus Lutatius Catulus outside Rome. The remnants of the rebels are wiped out by Gnaeus Pompeius in Etruria.
- Lepidus, with some 21,000 troops, manages to escape to Sardinia. Soon afterwards he becomes ill and dies, his battered army, now under command by Marcus Perperna, sails on to the Iberian Peninsula.
- Pompeius marches along the Via Domitia through Gallia Narbonensis crossing the Pyrenees to Spain. He joins with Quintus Metellus Pius to suppress the revolt of Quintus Sertorius, but is at first unsuccessful.
- The city of Tigranakert of Artsakh is built.
- Liu Xiang, Chinese scholar, editor of the Shan Hai Jing, compilator of the Lienü zhuan, and father of Liu Xin (d. 6 BC)
- Marcus Aemilius Lepidus, Roman statesman and consul (b. 120 BC)
- Vattagamani Abhaya, king of Sri Lanka