Political map of Europe & the Mediterranean 23 September 114 (Trajan’s Conquest of Armenia): In an attempt to placate the Romans, Shah Osroes I of Parthia had Axidares of Armenia deposed and replaced by another of his nephews, Parthamasiris (Parthamasiris of Armenia). Trajan invaded Armenia (Trajan's Parthian campaign) anyway, rejecting Parthamasiris’ attempt at submission and annexing the entire country to the Roman Empire (Roman Armenia) in 114.