BC, after having made peace arrangement with Rome and with Ariobarzanes I restored to the Cappadocian throne, Mithridates VI again invaded Cappadocia, reinstalling his son Ariarathes IX as puppet-king under Pontic rule. Mithridates' actions in Cappadocia sparked the First Mithridatic War (89-85 BC) between Rome and Pontus and its ally Armenia. Lucius Cornelius Sulla assumed command of the Roman war effort in 87 BC and soundly defeated Mithridates VI and his allies in 85 BC. His attention needed in Rome due to rising political challenges, Sulla imposed mild terms on Mithridates VI: Mithridates was to relinquish his control over Bithynia and Cappadocia, reinstating Ariobarzanes I and Nicomedies IV as Roman client-kings. In return, Rome allowed Mithridates VI to retain his rule over Pontus. When Nicomedes IV died in 74 BC, he bequeathed the Kingdom of Bithynia to the Roman Republic. His death caused a power vacuum in Asia Minor, allowing Mithridates VI to invade and conquer the leaderless kingdom. With Mirthidates VI again having designs on Roman protectorates in Asia Minor, including Cappadocia, Rome launched the Third Mithridatic War to end the Pontic threat. Dispatching Consul Lucius Licinius Lucullus to Asia, Rome drove Pontus and its ally Armenia out of Asia proper, reasserting Roman dominance over the Asian client kingdoms by 71 BC and conquering Pontus in the process. When Mithridates VI fled to Armenia, Lucullus invaded the kingdom in 69 BC. Despite initial successes, Lucullus was unable to decisively end the war. By 66 BC, Mithridates VI and Tigranes were able to retake their respective kingdoms and Lucullus was recalled to Rome. The Senate then sent Pompey the Great to the East in order to bring the war to a close. Upon his defeat by Pompey, Mithridates VI again fled to Armenia. Tigranes, however, refused to receive him. Mithridates VI was then forced to flee north across the Black Sea to the Bosporan Kingdom under the rule of his son Machares, bringing the war to an effective end in 65 BC. When Machares refused to launch a new war against Rome, Mithridates VI had him killed and assumed the Bosporan throne for himself. While Mithridates VI was eager to fight the Romans once more, his youngest son Pharnaces II of Pontus was not and plotted to remove his father from power. His plans were discovered, but the army, not wishing to engage Pompey and his armies, supported Pharnaces. They