Political map of Europe & the Mediterranean 29 February 36 AD (Civil Wars of Artabanus II): From 10–38 AD Parthia was dominated by Shah Artabanus II (Artabanus II of Parthia), who gained power when he overthrew the Roman-raised Vonones I (Vonones I of Parthia) in the civil war of 10–18 and regained power after being usurped by another pro-Roman shah, Tiridates III (Tiridates III of Parthia), in 36. A third civil war would break out later that year. Despite repeated attempts to expand into Armenia, Artabanus’ reigns saw an overall weakening of Parthian power as the empire fell victim to increasing infighting.