When Octavian became the first Roman Emperor Augustus, Archelaus became an important client monarch to Rome, and Augustus considered Archelaus loyal. Augustus had no commitment to provincialization as a matter of policy. In 25 BC, Augustus assigned Archelaus to rule Cilicia Trachea, the harbor city of Elaiussa Sebaste, as well as parts of the surrounding Cilician coast and Armenia Minor. By giving Archelaus all these extra territories to govern, Augustus was able to eliminate piracy and build a more solid bulwark against Parthia.