A revolt in Susiana, suppressed by the conspirator Gobryas, and another among the Sacse of the Tigris, quelled by Darius in person, are recorded on the rock of Behistun, in a supplementary portion of the Inscription.

We cannot date, unless it be by approximation, these various troubles; but there is reason to believe that they were almost all contained within a space not exceeding five or six years.

The date of the Behistun Inscription is fixed by internal evidence to about B.C.

516-515--in other words, to the fifth or sixth year of the reign of Darius.

Its erection seems to mark the termination of the first period of the reign, or that of disturbance, and the commencement of the second period, or that of tranquillity, internal progress, and patronage of the fine arts by the monarch.
It was natural that Darius, having with so much effort and difficulty reduced the revolted provinces to obedience, should proceed to consider within himself how the recurrence of such a time of trouble might be prevented.