86 BC (LXXXVI BC in Roman numerals) is a year of the 1st century BC.
First Mithridatic War
March 1: Lucio Cornelio Silla conquers Athens allied with Mithridates VI of Pontus, sacks it and removes the tyrant Aristion.
Lucio Licinio Lucullus defeats Mithridates in the battle of Tenedos.
Battle of Chaeronea. Silla's army defeats the army of Mithridates, led by General Archelaus.
The Illyrian people of the Dardani allies with Mithridates, but is defeated by Silla
1 October - Gaius Sallustio Crispus, Roman historian, politician and senator († 34 BC)
Fausto Cornelio Silla († 46 BC)
January 13 - Gaius Marius, Roman military and politician (b.157 BC)
March 1 - Aristion, ancient Greek philosopher, diplomat and military man
Marco Antonio Orator, politician, military and Roman orator (b.143 BC)
Jin Midi, Chinese politician and general (b.134 BC)
Wikimedia Commons contains images or other files about 86 BC.