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). An Arsacid, Tiridates I, was recognized by both empires as king of Armenia. Roman „friendship“ was imposed upon him—and in 66 he journeyed to Rome to be crowned by Nero—and, at the same time, as a Parthian prince, he was bound to accept the family ascendancy of the head of the Arsacids, the great king. The balance thus established between political and dynastic allegiance proved, however, precarious. Dynastic allegiance often became political as well, and Armenia continued to oscillate between the two rivals. None of the first eight Arsacids who reigned in Armenia founded a line of kings; it was left to the ninth, Vologases (Vałarš) II (180—191), to achieve this: his posterity of thirteen kings formed the Armenian Arsacid dynasty.