Experimentis cognitum est Barbaros malle Româ petere reges quam habere.These experiments are admirably represented in the invitation and expulsion of Vonones, (Annal. ii. 1 - 3,) Tiridates, (Annal. vi. 32-44,) and Meherdates, (Annal. xi. 10, xii. 10-14.) The eye of Tacitus seems to have transpierced the camp of the Parthians and the walls of the harem.