First Mithridatic War
In 89 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.