Note 7 — Chapter IX · THE EUPHRATES FRONTIER AND THE PARTHIANS.

Tacitus, Ann. xv. 2, 31. If, according to the preface of Agathangelos (p. 109, Langlois), at the time of the Arsacids the oldest and ablest prince bore rule over the country, and the three standing next to him were kings of the Armenians, of the Indians, and of the Massagetae, there is here perhaps at bottom the same arrangement. That the Partho-Indian empire, if it was combined with the main land, was likewise regarded as an appanage for the second son, is very probable.