The article below on the Arsacid Dynasty of Armenia is authored by Professor C. Toumanoff and was originally posted in the Encyclopedia Iranica). Kindly note that apart from the map and table of kings which have been posted on Encyclopedia Iranica and CAIS, all other pictures are unique to this posting.
Third dynasty of Armenia (in Armenian, Aršakuni), from the first to the mid-fifth century. The preceding dynasty of the Artaxiads became extinct about A.D. 12, amid a secessionist chaos caused by the perennial struggle of Iran and Rome over Armenia—the second throne, after Media, in the Iranian scheme of vassal kingdoms. It was then that the ex great king of Iran, Vonones I became king of Armenia. After him, seven Arsacid princes from Parthia came at different times to occupy the Armenian throne, interchangeably with six others, candidates of Rome. A compromise was finally attempted in 63 (Treaty of Rhandeia).