Roman command structure during First Mithridatic War refers to the chain of command of the forces sent east by the government of Rome to exercise the Mithridatic War mandate, requiring those forces to defeat Mithridates VI of Pontus, who had evoked the ire of the Senatus Populusque Romanus by slaughtering all the Romans his adherents could find on a single, pre-arranged day, an event now termed the Asiatic Vespers. Wikipedia