The Asiatic Vespers was the cleansing of Romans from Anatolia.

When Rome was Achieving Victory after Victory, many despised the Romans for their growing influence, one famous one was a Mithradates of Pergamon, King of Pontus. During the early days of Mithradates of Pergamon: "Mithridates orchestrated a massacre of Roman and Italian settlers remaining in several Anatolian cities, essentially wiping out the Roman presence in the region. This episode is known as the Asiatic Vespers" He made alliances with the rulers all around him as he planned an all out war with the Roman Republic, they sent General Sulla to retaliate with a massive invasion force and he essentially took back greece from Pontus but he was criticised for his brutality, especially to Athens, which he practically destroyed. So that was an attempted Genocide of Romans. Sulla was fighting with Gaius Marius and Gaius Marius wanted to sign a peace treaty with Pontus to piss of Sulla and effectively leaving his army there so the Pontic forces could rally and destroy Sulla and yadda yadda yadda, it was all about Politics back in Rome. Mithridates was then defeated entirely by Pompey and that was that, what happens when you massacre thousands of innocent Roman Citizens in cold blood.

TL:DR: The Asiatic Vespers lead to the Mithridatic Wars. Also a failed Genocide attempt (I may be stretching though)