Political map of Europe & the Mediterranean fall 161 (Vologases IV’s Conquest of Armenia): Antoninus Pius died in March 161 and was succeeded by the co-emperors Marcus Aurelius and Lucius Verus, neither of who had any military experience. Seizing advantage of the situation, Vologases IV, shah of a resurgent Parthia, invaded and occupied Armenia, defeating Roman legions sent from Cappadocia and Syria (Roman–Parthian War of 161–166).