This dynasty is obviously connected with the settlement of many Arabs by Tigranes the Great in the region of Edessa, Callirrhoe, Carrhae (Plin.

H.N.v.

20, 85; ax, 86; vi.

28, 142); respecting which Plutarch also (Luc.

21) states that Tigranes, changing the habits of the tent-Arabs, settled them nearer to his kingdom in order by their means to possess himself of the trade.
We may presumably take this to mean that the Bedouins, who were accustomed to open routes for traffic through their territory and to levy on these routes fixed transit-dues (Strabo, xvi.