Nevertheless, due to invasions of Cappadocia by Tigranes II of Armenia, the brother-in-law of Ariarathes IX, Ariobarzanes I of Cappadocia was deposed and Ariarathes IX of Cappadocia was again restored to power on separate occasions in 93 BC and 92 BC. However, as soon as Tigranes II of Armenia and his army returned home, Ariarathes IX of Cappadocia was deposed again by order of the Senate. Ariarathes IX of Cappadocia was restored to the throne for the last time at the outbreak of the First Mithridatic War (89-85 BC). He remained king of Cappadocia during the war but was forced to abdicate after his father King Mithridates VI of Pontus was defeated by the Romans in 85 BC, as coin evidence show that his last drachms minted in Cappadocia showed the symbol for regnal year 15, which corresponds to 86/5 BC.