The First Mithridatic War (89–85 BC) was a large conflict in Anatolia and ancient Greece that opposed the Roman Republic and the Pontic kingdom ruled by Mithridates VI Eupator. Although the Roman general Sulla was largely victorious on the battlefield, factional struggle in Rome forced him to end the war on a precarious stalemate.
The war began after more than a decade of geopolitical manoeuvring by Mithridates, who managed to considerably extend his realm despite constant Roman attempts to restrain him. In 90 BC, a Roman delegation headed by Manius Aquillius provoked Mithridates into war, as Aquillius hoped to receive its command. The following year, Mithridates rapidly captured the Roman province of Asia, exploiting local resentment of Roman tax collectors to massacre the Roman settlers. Taken by surprise while it was fighting a large revolt of its allies in Italy, Rome was initially unable to respond. This allowed Mithridates to encourage more defections from Greek cities, most notably Athens, where he installed the tyrant Aristion.